History of Services 1 - 50

Service 1 (1971 - 1989)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Changi Point ↔ Delta Circus	1971	11 April	Introduced between Changi Pt Ter and Delta Circus Ter under 1971 Bus Reorganisation.
		1973	11 March	Amended to ply Zion Rd towards Delta Circus Ter with the partial conversion of Kim Seng Rd to one-way traffic.
			1 July	Operations transferred to Singapore Bus Services.
		1974	1 December	Amended to ply New Upp Changi Rd, Bedok Plain, Bedok Hts, Upp East Coast Rd and Bedok Rd.
			8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1975	2 February	Amended to ply Tiong Bahru Rd and the extended Zion Rd towards Delta Circus Ter with the partial conversion of Kim Seng Rd and Outram Rd to one-way traffic.
			2 March	Amended to ply Sims Ave towards Changi Pt Ter with the conversion of Geylang Rd to one-way traffic.
			25 May	Amended to ply Bedok Wk and New Upp Changi Rd, skipping Bedok Hts and Upp East Coast Rd.
			TBC	Amended to new Changi Pt Ter.
			14 November	Amended to ply New Upp Changi Rd, skipping Bedok Plain and Bedok Wk.
		1976	15 February	Serves new staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
		1979	11 February	Amended to ply the extended Shenton Way towards Delta Circus Ter, skipping Parsi Rd and Anson Rd.
			14 October	Amended to ply Sims Ave East towards Changi Pt Ter with the conversion of Changi Rd to one-way traffic.
	Changi Point ↔ Delta Fringe Car Park		11 November	Amended to Delta Fringe Car Pk.
		1980	20 January	Amended to ply Spottiswoode Pk Rd with the partial conversion of Cantonment Rd to one-way traffic.
		1981	15 June	Amended to ply Loyang Ave and Loyang Way with the partial closure of Upp Changi Rd.
			11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
			8 November	Revised to operate on weekdays and Saturdays only.
		1987	6 April	Skips removed bus stop before College Rd along Outram Rd.
		1989	5 November	Discontinued.

Service 1A (1971 - 1974)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Changi Point ↔ Delta Circus	1971	1 August	Introduced between Changi Pt Ter and Delta Circus Ter.
		1973	11 March	Amended to ply Zion Rd towards Delta Circus Ter with the partial conversion of Kim Seng Rd to one-way traffic.
			1 July	Operations transferred to Singapore Bus Services.
		1974	3 February	Re-numbered Service 3 under 1974 Bus Rationalisation.

Service 2 (Current)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Changi Point ↔ Commonwealth Ave	1971	11 April	Introduced between Changi Pt Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
Known as prior to 1 November 2001		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	1 December	Amended to ply New Upp Changi Rd, Bedok Plain, Bedok Hts, Upp East Coast Rd and Bedok Rd.
		1975	2 February	Amended to ply new slip road from Tiong Bahru Rd to Outram Rd with the conversion of Seng Poh Rd to one-way traffic.
			2 March	Amended to ply Sims Ave towards Changi Pt Ter with the conversion of Geylang Rd to one-way traffic.
			25 May	Amended to ply Bedok Wk and New Upp Changi Rd, skipping Bedok Heights and Upp East Coast Rd.
			TBC	Amended to new Changi Pt Ter.
			14 November	Amended to ply New Upp Changi Rd, skipping Bedok Plain and Bedok Wk.
		1977	17 May	Amended to ply Commonwealth Ave Extension and Nth Buona Vista Rd towards Commonwealth Ave Ter.
			29 August	Amended to ply Holland Ave, Holland Dr and Nth Buona Vista Rd towards Commonwealth Ave Ter.
		1979	14 October	Amended to ply Sims Ave East towards Changi Pt Ter with the conversion of Changi Rd to one-way traffic.
		1980	28 December	Amended to ply Jln Bt Merah and Kg Bahru Rd, skipping Outram Rd, Tiong Bahru Rd and Henderson Rd.
		1981	15 June	Amended to ply Loyang Ave and Loyang Way with the partial closure of Upp Changi Rd.
	Changi Village ↔ Buona Vista	1982	27 May	Amended to Buona Vista Ter.
		1987	27 September	Amended to ply the extended Eu Tong Sen St towards Changi Village Ter to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Changi Village Ter to facilitate the second stage of road expansion along New Bridge Rd.
			13 December	Serves new staggered bus stop opposite Peninsula Plaza along Nth Bridge Rd, skipping the bus stop outside St Andrew's Cath.
		1989	29 January	Serves relocated bus stop opposite Sri Mariamman Tp along Sth Bridge Rd, skipping the bus stop opposite Jamae Mque.
				Serves additional bus stop opposite Upp Hokien St along Sth Bridge Rd.
		1990	22 July	Serves additional bus stop outside Ellenborough Mkt along Eu Tong Sen St.
	Changi Village ↔ New Bridge Rd	1992	29 November	Shortened to New Bridge Rd Ter under TransitLink Network Integration Exercise Phase 10.
		1993	11 April	Amended to ply Jln Sultan, Victoria St, Hill St and New Bridge Rd, skipping South Bridge Rd and Neil Rd.
		1994	3 July	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, Nth Bridge Rd and Jln Sultan.
		1996	TBC	Serves additional bus stop outside Kallang Stn along Sims Ave.
		1997	TBC	Skips removed bus stop opposite Bena Pk along Upp Changi Rd Nth.
			7 December	Amended to ply Upp Pickering St, Sth Bridge Rd and Kreta Ayer Rd with the partial closure of New Bridge Rd to facilitate the construction of NE4DT19Chinatown station on the North East Line.
	2Changi Village ↔ New Bridge Rd 2AChangi Village → New Upp Changi Rd	1999	TBC	Serves bus stop outside Bugis Stn along Victoria St, skipping the bus stop opposite Bugis Junction.
				2AIntroduced between Changi Village Ter and New Upp Changi Rd (Bedok Stn) during evening peak hours on weekdays.
		2002	20 April	Amended to ply the reinstated New Bridge Rd, skipping Upp Pickering St, Sth Bridge Rd and Kreta Ayer Rd.
			TBC	Serves new pair of bus stops outside and opposite Changi Chapel Museum along Upp Changi Rd Nth.
		2004	TBC	Serves new bus stop before Changi Fire Stn along Upp Changi Rd.
		2005	TBC	Serves new bus stop outside ITE Reg Campus along Upp Changi Rd.
		2007	22 May	Designated wheelchair-accessible bus service (WAB).
		2008	TBC	2First bus from New Bridge Rd Ter brought forward to 0545 hrs on Sundays and Public Holidays.
	Changi Village ↔ New Bridge Rd	2012	23 July	2ADiscountinued.
		2013	29 December	Amended to ply Upp Changi Lk with the partial closure of Upp Changi Rd.
(Current)		2016	18 September	Operations transferred to Go-Ahead Singapore.
				First bus from Changi Village Ter brought forward to 0520 hrs on weekdays and Saturdays, and 0540 hrs on Sundays and Public Holidays.
	Changi Village ↔ Kampong Bahru	2018	10 March	Extended to Kg Bahru Ter with the closure of New Bridge Rd Ter.
				First bus from Kg Bahru Ter brought forward to 0540 hrs daily.
	2Changi Village ↔ Kampong Bahru 2AKampong Bahru → New Upp Changi Rd		12 March	2AIntroduced from Kg Bahru Ter to New Upp Changi Rd (Tanah Merah Stn Exit B) during evening peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.
			8 April	Serves new pair of bus stops after Somapah Rd and before Simei Rd along Upp Changi Rd East.
	2Changi Village ↔ Kampong Bahru 2BChangi Village → New Upp Changi Rd	2023	25 September	2ADiscontinued.
				2BIntroduced from Changi Village Ter to New Upp Changi Rd (Bedok Stn Exit A) during evening peak hours daily. Wheelchair-accessible bus service (WAB) at launch.
		2025	9 March	Serves additional bus stop outside Outram Pk Stn Exit 4 along New Bridge Rd.

Service 2A (1971 - 1974)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Changi Point ↔ Commonwealth Avenue	1971	1 August	Introduced between Changi Pt Ter and Commonwealth Ave Ter.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	3 February	Discontinued under 1974 Bus Rationalisation.

Service 3

1st Generation (1974 - 1991)

Operator	Route	Year	Date	Service changes
	Changi Point ↔ Delta Circus	1974	3 February	Re-numbered from Service 1A as a service between Changi Pt Ter and Delta Circus Ter.
			1 December	Amended to ply New Upp Changi Rd, Bedok Plain, Bedok Hts, Upp East Coast Rd and Bedok Rd.
		1975	2 February	Amended to ply Tiong Bahru Rd and the extended Zion Rd towards Delta Circus Ter with the partial conversion of Kim Seng Rd and Outram Rd to one-way traffic.
			2 March	Amended to ply Sims Ave towards Changi Pt Ter with the conversion of Geylang Rd to one-way traffic.
			25 May	Amended to ply Bedok Wk and New Upp Changi Rd, skipping Bedok Hts and Upp East Coast Rd.
			TBC	Amended to new Changi Pt Ter.
		1976	15 July	Amended to ply Upp Changi Rd, skipping Telok Paku Rd and Nicoll Dr.
	Bedok South Rd ↺ New Bridge Rd		2 August	Shortened to start from Bedok Sth Rd Ter and loop at New Bridge Rd.
	Bedok ↺ New Bridge Rd	1979	8 April	Amended to Bedok Int and converted to a semi-express service.
			14 October	Amended to ply Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way traffic.
		1983	27 November	Integrated with Service 6 and amended to ply Kallang Rd/Crawford St and Victoria St/Nth Bridge Rd.
		1986	12 January	Converted to trunk service.
			6 July	Serves the bus stop outside Blk 414 along Sims Ave, skipping the bus stop outside Blk 416.
	Bedok ↔ Jurong East	1987	1 February	Extended to Jurong East Int.
			27 September	Amended to ply the extended Eu Tong Sen St towards Bedok Int to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Bedok Int to facilitate the second stage of road expansion along New Bridge Rd.
		1988	20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
		1989	19 February	Serves new bus stop outside Blk 135 along Jurong East St 13.
			19 November	Serves new bus stop outside Kallang Stn along Sims Ave.
		1990	22 July	Serves additional bus stop outside Ellenborough Mkt along Eu Tong Sen St.
		1991	6 January	Discontinued under TransitLink Network Integration Exercise Phase 1.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
	Tampines ↺ Pasir Ris St 71	2002	7 April	Introduced between Tampines Int and Pasir Ris St 71 (Loop) with the integration of Services 294 and 357.
		2003	TBC	Serves new bus stop outside Blk 741 along Pasir Ris Dr 10.
	3Tampines ↺ Punggol Stn 3ATampines → Pasir Ris Dr 12 3BPasir Ris Dr 1 → Pasir Ris		19 October	Extended to loop at Punggol Ctrl.
				3AIntroduced from Tampines Int to Pasir Ris Dr 12 (Blk 747A) during evening peak hours on weekdays and after the last bus of Service 3 daily.
				3BIntroduced from Pasir Ris Dr 1 (Blk 738) to Pasir Ris Int during evening peak hours on weekdays.
	3Tampines ↔ Punggol 3ATampines → Pasir Ris Dr 12 3BPasir Ris Dr 1 → Pasir Ris		30 November	Amended to Punggol Temp Int.
		2008	TBC	3First bus from Punggol Temp Int brought forward to 0540 hrs on weekdays.
		2009	5 September	Serves new pair of bus stops outside Blk 231A CP and outside Blk 485 along Pasir Ris Dr 4.
			26 October	Designated wheelchair-accessible bus service (WAB).
		2012	29 April	Serves new bus stop outside Blk 612 along Pasir Ris Dr 1.
		2014	24 August	Serves new pair of bus stops before and after Punggol Rd along TPE.
		2015	12 December	Amended to ply the extended Pasir Ris Dr 8 with the permanent closure of the west ring of Pasir Ris Ctrl.
(Current)	3Tampines ↔ Punggol 3ATampines → Pasir Ris Dr 12	2016	4 September	Operations transferred to Go-Ahead Singapore.
				3First bus from Tampines Int brought forward to 0505 hrs on weekdays.
				3BDiscontinued with the commencement of the Loyang Bus Package.
		2017	21 October	Serves new pair of bus stops outside Tampines East Stn along Tampines Ave 2.
		2022	30 October	Skips removed bus stop after Pasir Ris Dr 3 along Pasir Ris Dr 8.

Service 4

1st Generation (1971 - 1974)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Changi Point ↺ Lloyd Leas Estate	1971	11 April	Introduced between Changi Pt Ter and Lloyd Leas Est (Loop) under 1971 Bus Reorganisation.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	3 February	Discontinued under 1974 Bus Rationalisation.

2nd Generation (1979 - 1993)

Operator	Route	Year	Date	Service changes
	Bedok ↺ Lor 1 Geylang	1979	11 March	Introduced between Bedok Int and Lor 1 Geylang (Loop).
			14 October	Amended to ply Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way traffic.
	Bedok ↺ Moulmein Rd	1980	11 February	Extended to loop at Moulmein Rd.
	Bedok ↔ St. Michael's	1988	31 July	Extended to St. Michael's Ter.
		1989	19 November	Serves new bus stop outside Kallang Stn along Sims Ave.
	Pasir Ris ↔ St. Michael's	1990	11 March	Integrated with Service 19 and extended to Pasir Ris Int.
	Tampines ↔ St. Michael's	1992	29 November	Shortened to Tampines Int under TransitLink Network Integration Exercise Phase 10.
		1993	23 May	Integrated with Services 21 and 67 and discontinued under TransitLink Network Integration Exercise Phase 13.

3rd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current)	Tampines ↺ Changi North Way	2013	17 March	Introduced between Tampines Int and Changi Nth Way (Loop) under the LTA's Bus Service Enhancement Programme (BSEP), operating from 0600 hrs to 2330 hrs daily.
			31 March	Designated wheelchair-accessible bus service (WAB).
		2025	23 February	Serves a new pair of bus stops in front of and opposite Estella Gdns along Flora Rd.

Service 5

1st Generation (1971 - 1999)

Operator	Route	Year	Date	Service changes
Amalgamated Bus Company	Upper Changi Road 8¼ ms ↔ Commonwealth Ave	1971	11 April	Introduced between Upp Changi Rd 8¼ m.s. Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
			28 September	Amended to ply the extended Ganges Ave towards Upp Changi Rd 8¼ m.s. Ter.
		1972	11 June	Amended to ply the extended Upp Cross St with the partial conversion of Havelock Rd to one-way traffic, skipping New Bridge Rd.
	Upp Changi Rd 8¼ ms ↔ Bukit Timah	1973	TBC	Extended to Bt Timah Ter.
		1973	1 July	Operations transferred to Singapore Bus Services.
	Chai Chee ↔ Bukit Timah	1974	3 February	Shortened to Chai Chee Ter under 1974 Bus Rationalisation.
		1975	2 March	Amended to ply Sims Ave towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
	Lor 1 Geylang ↔ Bukit Timah	1977	17 October	Shortened to Geylang Fringe Car Pk and amended to ply Lavender St, Kallang Bahru, Boon Keng Rd and Lor 1 Geylang.
		1979	11 November	Amended to ply Ganges Ave towards Bt Timah Ter with the realignment of Delta Circus.
			30 December	Amended to ply Jln Anak Bt towards Geylang Fringe Car Pk with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1981	15 November	Amended to use new u-turn near Eng Neo Ave towards Geylang Fringe Car Pk, skipping the bus stop outside Turf City along Dunearn Rd and the bus stop after Third Ave along Bt Timah Rd.
	Lor 1 Geylang ↔ Bukit Panjang	1986	1 June	Extended to Zhenghua Ter.
		1987	27 September	Amended to ply the extended Eu Tong Sen St towards Lor 1 Geylang Ter to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Lor 1 Geylang Ter to facilitate the second stage of road expansion along New Bridge Rd.
			13 December	Serves new staggered bus stop opposite Peninsula Plaza along Nth Bridge Rd, skipping the bus stop outside St Andrew's Cath.
		1989	25 June	Skips the bus stop after Tan Boon Chong Ave along Holland Rd.
			19 November	Serves new bus stop outside Kallang Stn along Sims Ave.
		1990	22 July	Serves additional bus stop outside Ellenborough Mkt along Eu Tong Sen St.
		1992	29 March	Amended to ply Holland Ave, Commonwealth Ave, Margaret Dr, Alexandra Rd, Lower Delta Rd, Jln Bt Merah, Kg Bahru Rd and Eu Tong Sen St/New Bridge Rd under TransitLink Network Integration Exercise Phase 6, skipping Queensway, Commonwealth Ave, Alexandra Rd, Ganges Ave and Havelock Rd.
		1993	11 April	Amended to ply Jln Sultan, Victoria St, Hill St and New Bridge Rd, skipping Sth Bridge Rd and Upp Cross St.
		1994	3 July	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, Nth Bridge Rd and Jln Sultan.
		1995	17 September	Operations transferred to Trans Island Bus Services.
		1997	TBC	Serves additional bus stop after Jln Bt Merah along Kg Bahru Rd.
			7 December	Amended to ply Upp Pickering St, Sth Bridge Rd and Neil Rd with the partial closure of New Bridge Rd to facilitate the construction of NE4DT19Chinatown station on the North East Line.
			8 December	Skips the bus stop outside Kallang Stn along Sims Ave.
		1999	26 December	Discontinued under Bukit Panjang LRT Rationalisation.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current)	Pasir Ris ↔ Bukit Merah	2007	11 March	Introduced between Pasir Ris Int and Bt Merah Int, operating between 0530 hrs and 2330 hrs from Pasir Ris Int and Bt Merah Int daily.
		2008	TBC	Serves new pair of bus stops along New Loyang Lk.
		2011	27 June	Designated wheelchair-accessible bus service (WAB).
			28 August	Amended to ply Jln Tenaga, Bedok Reservoir Rd and Jln Damai with the partial closure of Kaki Bt Ave 1 to facilitate the construction of DT28Kaki Bukit station on the Downtown Line.
		2016	24 April	Amended to ply the reinstated Kaki Bt Ave 1, skipping Jln Tenaga, Bedok Reservoir Rd and Jln Damai.
		2019	21 July	Amended to ply Flora Dr, Flora Rd and Mariam Way, skipping a section of Upp Changi Rd Nth.
		2023	8 January	Skips the bus stop outside Newton Stn Exit B along Scotts Rd temporarily to facilitate upgrading works.
	5Pasir Ris ↔ Bukit Merah 5AMariam Way → Upp Changi Rd East 5BSimei St 3 → Mariam Way		14 August	5AIntroduced from Mariam Way (Aft Ballota Pk) to Upp Changi Rd East (Upp Changi Stn/SUTD) during peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.
				5BIntroduced from Simei St 3 (Simei Stn) to Mariam Way (Bef Mariam Wk) during evening peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.
			27 August	Serves reinstated bus stop outside Newton Stn Exit B along Scotts Rd.
		2025	23 February	Serves a new pair of bus stops in front of and opposite Estella Gdns along Flora Rd.

Service 6

1st Generation (1977 - 1983)

Operator	Route	Year	Date	Service changes
	Chai Chee ↺ North Bridge Rd	1977	11 July	Introduced between Chai Chee Ter and Nth Bridge Rd (Loop) as a semi-express service.
	Bedok ↺ North Bridge Rd	1979	25 February	Amended to Bedok Int.
			14 October	Amended to ply Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way traffic.
		1983	27 November	Integrated with Service 3 and discontinued.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	Pasir Ris ↺ Loyang Cres	1993	25 October	Introduced between Pasir Ris Int and Loyang Cres (Loop) as a peak hour service on weekdays and Saturdays only.
		1994	24 October	Converted to day service.
		2003	TBC	Serves new bus stop opposite Loyang Ind Est along Loyang Ave.
		2004	20 December	Amended to ply Loyang Way and Loyang Ave towards Pasir Ris Int.
		2013	3 December	Designated wheelchair-accessible bus service (WAB).
(Current)		2016	18 September	Operations transferred to Go-Ahead Singapore.
		2023	26 February	Temporarily amended to ply the bus-only corridor along Loyang Ave with the partial closure of Loyang Ave to facilitate the construction of Loyang Viaduct and CR3Loyang station on the Cross Island Line, skipping a pair of bus stops after Pasir Ris Dr 3 and before New Loyang Lk along Loyang Ave.

Service 7 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001.	Bedok ↺ Holland Rd Fringe Car Pk	1979	11 March	Introduced between Bedok Int and Holland Rd Fringe Car Pk (Loop) as a semi-express service, replacing Blue Arrow Service 307.
			14 October	Amended to ply Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way traffic.
	Bedok ↔ Clementi	1983	30 October	Integrated with Service 191 and extended to Clementi Int.
	Bedok ↔ Jurong East	1985	6 January	Extended to Jurong East Ter.
			30 June	Amended to Jurong East Int.
			1 September	Converted to trunk service.
		1987	18 May	First bus from Bedok Int brought forward to 0530 hrs daily.
		1989	19 February	Serves new bus stop outside Blk 135 along Jurong East St 13.
			5 November	Amended to ply Mountbatten Rd, Geylang Rd, Kallang Rd/Crawford St and Victoria St/Nth Bridge Rd, skipping Nicoll Highway.
	Bedok ↔ Clementi	1991	7 April	Shortened to Clementi Int and amended to ply Clementi Ave 5 towards Bedok Int under TransitLink Network Integration Exercise Phase 3, skipping Commonwealth Ave West and Clementi Ave 2.
			28 April	Amended to ply Clementi Ave 5 towards Clementi Int under TransitLink Network Integration Exercise Phase 4.
		1992	19 July	Amended to ply Orchard Lk due to the closure of Grange Rd to facilitate road expansion works.
		2002	7 July	Skips the bus stop opposite Mandarin Singapore along Orchard Rd.
		2005	5 June	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
			26 June	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd and amended to ply Grange Rd with the partial closure of Somerset Rd.
		2006	29 October	Amended to Clementi Temp Int.
		2007	20 August	Designated wheelchair-accessible bus service (WAB).
		2011	19 November	Amended to Bedok Temp Int.
			26 November	Amended to Clementi Integrated Transport Hub.
		2014	30 November	Amended to Bedok Integrated Transport Hub.
	7Bedok ↔ Clementi 7ABedok → Orchard Blvd 7BClementi → Orchard Rd	2018	25 February	7AIntroduced from Bedok Int to Orchard Blvd (Bef Orchard Stn Exit B). Wheelchair-accessible bus service (WAB) at launch.
				7BIntroduced from Clementi Int to Orchard Rd (Dhoby Ghaut Stn). Wheelchair-accessible bus service (WAB) at launch.

Service 8

1st Generation (1979 - 1989)

Operator	Route	Year	Date	Service changes
	Bedok ↺ Shenton Way	1979	26 February	Introduced between Bedok Int and Shenton Way (Loop) as a semi-express service, operating on weekdays and Saturdays only.
			14 October	Amended to ply Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way traffic.
		1981	11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
	Bedok ↺ Robinson Rd	1982	5 April	Amended to ply Bedok Sth Rd, Bedok Sth Ave 1 and ECP, skipping Connaught Dr, Collyer Quay, Raffles Quay and Shenton Way.
	Bedok ↺ Marina Ctr	1986	30 November	Extended to loop at Marina Ctr.
		1989	6 November	Discontinued.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Pasir Ris ↔ Toa Payoh	1990	1 March	Introduced between Pasir Ris Int and Toa Payoh Int.
	Tampines ↔ Toa Payoh	1992	29 November	Shortened to Tampines Int under TransitLink Network Integration Exercise Phase 10.
		1994	5 March	Amended to ply Kim Keat Lk and Lor 6 Toa Payoh towards Toa Payoh Int.
		1995	10 September	Amended to ply Tampines Ave 1, Tampines Ave 10 and Bedok Nth Rd with the opening of Temasek Polytechnic.
		1998	TBC	First bus from Tampines Int brought forward to 0530 hrs on weekdays.
			31 May	Amended to Toa Payoh Temp Int.
				Serves new pair of bus stops outside and opposite Toa Payoh Swim Cplx along Lor 6 Toa Payoh.
		2001	TBC	Serves new pair of bus stops outside and opposite Tropica Condo along Tampines Ave 1.
		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
		2011	4 September	Amended to skip Bendemeer Rd, Whampoa Nth and Serangoon Rd towards Toa Payoh Int with the permanent closure of Whampoa North.
		2017	12 February	Serves new pair of bus stops before and after Ubi Rd 3 along Ubi Ave 2.
			21 August	Designated wheelchair-accessible bus service (WAB).
			21 October	Serves new pair of bus stops outside Tampines East Stn along Tampines Ave 2.
		2022	27 November	Serves new pair of bus stops outside and opposite HomeTeamNS Bedok along Bedok Nth Rd.

Service 9 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Lor 1 Geylang ↔ Changi Village	1979	9 April	Introduced between Geylang Fringe Car Pk and Changi Pt Ter, operating on weekdays and Saturdays only.
			14 October	Amended to ply Sims Ave East towards Changi Pt Ter with the conversion of Changi Rd to one-way traffic.
		1981	15 June	Amended to ply Loyang Ave and Loyang Way with the partial closure of Upp Changi Rd.
			8 November	Extended to operate on Sundays and public holidays.
	Lor 1 Geylang ↺ Changi AirFreight Ctr	1983	25 June	Integrated with Services 391 and 395 and extended to loop at Changi Airport Cargo Cplx under Changi Airport Bus Plan 1983.
		1985	15 December	Amended to ply Loyang Ave, skipping Loyang Way.
		1987	20 September	Skips 2 pairs of removed bus stops along Upp Changi Rd East with the opening of TPE.
		1988	10 April	Amended to ply Upp Changi Rd East, Simei Rd, Tampines Ave 2 and Tampines Ave 7, skipping Bedok Rd and Upp Changi Rd.
	Bedok ↺ Changi AirFreight Ctr	1992	29 November	Shortened to Bedok Int under TransitLink Network Integration Exercise Phase 10.
		1993	13 September	Skips the bus stop outside Bedok Stn along New Upp Changi Rd towards Bedok Int.
		1994	TBC	First bus brought forward to 0545 hrs daily.
		1995	3 December	Amended to ply Bedok Rd, Upp Changi Rd, Simei Ave and Simei St 3, skipping Upp Changi Rd East.
	9Bedok ↺ Changi AirFreight Ctr 9ABedok → Loyang Ave	2001	TBC	9AIntroduced from Bedok Int to Loyang Ave (Blk 149A) during evening peak hours on weekdays.
		2003		Serves new pair of bus stops outside and opposite Loyang Ind Est along Loyang Ave.
		2004		Serves new bus stop before Changi Fire Stn along Upp Changi Rd.
		2008		Serves new bus stop outside Changi Beach CP 2 along Nicoll Dr, skipping the bus stop opposite Changi Beach CP 2.
				9First bus brought forward to 0530 hrs daily.
		2011	19 November	Amended to Bedok Temp Int and serve bus stop outside Bedok Stn Exit A.
		2014	30 November	Amended to Bedok Integrated Transport Hub.
			3 December	Designated wheelchair-accessible bus service (WAB).
		2017	21 October	Serves new pair of bus stops outside Tampines East Stn along Tampines Ave 2.
		2023	26 February	Temporarily amended to ply the bus-only corridor along Loyang Ave and Loyang Way with the partial closure of Loyang Ave to facilitate the construction of Loyang Viaduct and CR3Loyang station on the Cross Island Line, skipping 3 pairs of bus stops along Loyang Ave.
	9Bedok ↺ Changi AirFreight Ctr 9ABedok → Loyang Ave 9BSimei St 3 → Airline Rd		27 November	9BIntroduced from Simei St 3 (Simei Stn) to Airline Rd (3rd Cargo Agents) during morning peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.

Service 10 (Current)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Bedok Rd ↔ Prince Edward	1971	11 April	Introduced between Bedok Rd Ter and Prince Edward Ter under 1971 Bus Reorganisation.
	Bedok Rd ↔ Shipyard Rd		16 June	Extended to Shipyard Rd Ter.
		1972	24 December	Amended to ply Jln Samulun before terminating at Shipyard Rd Ter.
(Current) Known as prior to 1 November 2001.		1973	1 July	Operations transferred to Singapore Bus Services.
	Upp Changi Rd 8¼ ms ↔ Shipyard Rd	1974	10 November	Amended to Upp Changi Rd 8¼ ms (13.3km) Ter.
			8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1976	15 February	Serves new staggered bus stop outside Overseas Union Finance along Robinson Rd.
	Upp Changi Rd 8¼ ms ↔ Jurong	1978	1 June	Amended to Jurong Int.
		1979	11 February	Amended to ply the extended Shenton Way towards Jurong Int, skipping Parsi Rd and Anson Rd.
			TBC	Relocated to Upp Changi Rd 15.5km Ter.
	Somapah Depot ↔ Jurong	1980	16 June	Amended to Somapah Depot.
	Somapah ↔ Jurong	1981	28 June	Amended to Somapah Int.
			11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
	Tampines ↔ Jurong	1984	27 May	Extended to Tampines Ter.
		1986	7 December	Serves new bus stop before Bedok Sth Ave 3 along Upp East Coast Rd.
		1987	29 November	Amended to Tampines Int.
		1988	3 January	Serves new staggered bus stop opposite Treasury Bldg along Shenton Way, skipping the bus stop opposite Marina Hse.
			25 October	Skips a pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	Tampines ↔ Clementi	1990	1 July	Shortened to Clementi Int with the opening of Boon Lay Int.
		1992	28 June	Amended to ply Tg Katong Rd, Dunman Rd and Old Airport Rd under TransitLink Network Integration Exercise Phase 8.
		1994	29 May	Serves 2 new pairs of bus stops outside The Concourse, outside Golden Mile Twr and outside and opposite Suntec City along Nicoll Highway.
		1997	TBC	Serves an additional pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	Tampines ↔ Kent Ridge	1999	7 March	Shortened to Kent Ridge Ter with the introduction of Service 188.
			TBC	Skips a pair of removed bus stops outside and opposite Wishart Rd along Telok Blangah Rd.
		2001	15 April	Amended to ply Esplanade Dr, skipping Connaught Dr/Empress Pl.
		2002	TBC	Skips removed bus stop opposite ITE Pasir Panjang along Telok Blangah Rd.
			TBC	First bus from Kent Ridge Ter brought forward to 0600 hrs on weekdays and Saturdays.
		2004	20 April	Amended to ply Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd to facilitate reinstatement works for the collapsed Nicoll Highway.
			TBC	Serves new bus stop before Changi Fire Stn along Upp Changi Rd.
			6 December	Amended to ply the reinstated Nicoll Highway, skipping Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd.
		2005	2 July	Serves bus stop outside Fullerton Sq along Fullerton Rd and an additional bus stop opposite AIA Twr along Robinson Rd with the abolition of the bus stop outside Clifford Ctr along Collyer Quay.
		2006	19 March	Amended to ply Cassia Lk, Cassia Cres, Guillemard Rd and Guillemard Camp Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction of CC8Dakota on the Circle Line.
			29 October	Serves new bus stop outside VivoCity along Telok Blangah Rd.
		2008	7 December	Skips removed bus stop opposite Temenggong D Mque along Telok Blangah Rd.
			29 December	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Cassia Lk, Guillemard Rd and Guillemard Camp Rd.
		2012	26 March	Designated wheelchair-accessible bus service (WAB).

Service 11

1st Generation (1971 - 1988)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Bedok Rd ↔ Tg Pagar Rd	1971	11 April	Introduced between Bedok Rd Ter and Tg Pagar Ter under 1971 Bus Reorganisation.
		1973	1 July	Operations transferred to Singapore Bus Services.
	Upp Changi Rd 8¼ ms ↔ Tg Pagar Rd	1974	3 February	Amended to Upp Changi Rd 8¼ ms (13.3km) Ter under 1974 Bus Rationalisation.
		1975	2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Upp Changi Rd 13.3 km Ter with the conversion of Geylang Rd to one-way traffic.
	Upp Changi Rd 8¼ ms ↔ New Bridge Rd	1979	28 May	Amended to New Bridge Rd Ter.
			TBC	Relocated to Upp Changi Rd 15.5km Ter.
	Somapah Depot ↔ New Bridge Rd	1980	16 June	Amended to Somapah Depot.
	Somapah ↔ New Bridge Rd	1981	28 June	Amended to Somapah Int.
		1986	7 December	Serves new bus stop before Bedok Sth Ave 3 along Upp East Coast Rd.
		1987	6 June	Amended to relocated New Bridge Rd Ter.
			27 September	Amended to ply the extended Eu Tong Sen St towards Somapah Ter to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Somapah Ter to facilitate the second stage of road expansion along New Bridge Rd.
		1988	23 October	Integrated with Service 12 and discontinued.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Lor 1 Geylang ↺ Kallang Pk/Natl Stadium	1990	14 April	Introduced between Lor 1 Geylang Ter and Stadium Blvd (Loop).
		1994	12 June	Amended to ply Stadium Rd before plying Stadium Blvd.
		1999	TBC	Last bus extended to 2330 hrs daily.
		2002	8 February	Amended to ply Stadium Wk with the partial closure of Stadium Blvd to facilitate the construction of CC6Stadium on the Circle Line.
		2004	20 April	Skips bus stop opposite Kallang Care Ctr along Mountbatten Rd.
		2005	5 June	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
			26 June	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.
		2006	18 February	Amended to ply Stadium Cres with the full closure of Stadium Blvd to facilitate the construction of CC6Stadium on the Circle Line.
		2010	29 September	Amended to ply Mountbatten Rd and Stadium Blvd with the closure of Stadium Rd to facilitate the construction of the Singapore Sports Hub.
	Lor 1 Geylang ↺ Rhu Cross	2014	8 June	Extended to loop at Rhu Cross under the LTA's Bus Service Enhancement Programme (BSEP).
				First bus brought forward to 0600 hrs daily.
			29 September	Designated wheelchair-accessible bus service (WAB).
		2017	23 April	Serves bus stops outside and opposite Singapore Indoor Stadium along Stadium Cres/Wk in both directions.
		2024	28 April	Serves new bus stops outside Tg Rhu Stn along Tg Rhu Rd.

Service 12 (Current)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Bedok Rd ↔ Commonwealth Ave	1971	11 April	Introduced between Bedok Rd Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
(Current) Known as prior to 1 November 2001		1973	1 July	Operations transferred to Singapore Bus Services.
	Upp Changi Rd 8¼ ms ↔ Commonwealth Ave	1974	3 February	Amended to Upp Changi Rd 8¼ ms (13.3km) Ter under 1974 Bus Rationalisation.
		1975	2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Upp Changi Rd 13.3 km Ter with the conversion of Geylang Rd to one-way traffic.
			2 November	Amended to temporary bus terminal along Holland Dr with the partial closure of Commonwealth Ave Ter to facilitate the extension of Commonwealth Ave.
			11 December	Amended to ply New Upp Changi Rd, Bedok Wk, Bedok Plain and Bedok Highway.
		1977	17 January	Amended to ply Bedok View, skipping Bedok Wk.
			29 August	Amended back to Commonwealth Ave Ter via Nth Buona Vista Rd.
		1979	TBC	Relocated to Upp Changi Rd 15.5km Ter.
	12Upp Changi Rd 8¼ ms ↔ Commonwealth Ave 12ABedok Sth Ave 3 ↺ North Bridge Rd		31 December	12AIntroduced between Bedok Sth Ave 3 and North Bridge Rd (Loop) as a peak hour variant, operating daily.
	12Somapah Depot ↔ Commonwealth Ave 12ABedok Sth Ave 3 ↺ North Bridge Rd	1980	16 June	Amended to Somapah Depot.
			13 July	Amended to ply Commonwealth Ave with the conversion of Queens Circus to a signalised junction, skipping Queensway and Holland Rd.
			28 December	Amended to ply Upp Changi Rd East, skipping Bedok Rd and Upp Changi Rd.
	12Somapah ↔ Commonwealth Ave 12ABedok Sth Ave 3 ↺ North Bridge Rd	1981	28 June	Amended to Somapah Int.
			TBC	12ARevised to operate on weekdays only.
	12Somapah ↔ Buona Vista 12ABedok Sth Ave 3 ↺ North Bridge Rd	1982	27 May	Amended to Buona Vista Ter.
		1984	2 September	12ADiscontinued.
	Somapah ↔ Buona Vista	1987	27 September	Amended to ply Nth Canal Rd and Eu Tong Sen St, skipping Upp Circular Rd.
			13 December	Serves new staggered bus stop opposite Peninsula Plaza along Nth Bridge Rd, skipping the bus stop outside St Andrew's Cath.
	Pasir Ris ↔ New Bridge Rd	1988	23 October	Extended to Pasir Ris Ter and shortened to New Bridge Rd Ter.
		1989	10 December	Amended to Pasir Ris Int.
		1990	22 July	Serves additional bus stop outside Ellenborough Mkt along Eu Tong Sen St.
		1993	11 April	Amended to ply Jln Sultan, Victoria St, Hill St and New Bridge Rd, skipping Sth Bridge Rd and Upp Cross St.
		1994	3 July	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, Nth Bridge Rd and Jln Sultan.
		1997	7 December	Amended to ply Upp Pickering St, Sth Bridge Rd and Kreta Ayer Rd with the partial closure of New Bridge Rd to facilitate the construction of NE4DT19Chinatown station on the North East Line.
		2001	TBC	Serves new pair of bus stops outside and opposite Lion Home for Elders along Bedok Sth Rd.
		2002	20 April	Amended to ply the reinstated New Bridge Rd, skipping Upp Pickering St, Sth Bridge Rd and Kreta Ayer Rd.
		2005	5 June	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
			26 June	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.
		2006	3 December	Designated wheelchair-accessible bus service (WAB).
		2007	TBC	First bus from New Bridge Rd Ter brought forward to 0600 hrs on weekdays and Saturdays.
		2014	10 August	Serves new bus stop opposite Blk 2 along Mountbatten Rd.
(Current)		2016	18 September	Operations transferred to Go-Ahead Singapore.
		2017	21 October	Serves new pair of bus stops outside Tampines East Stn along Tampines Ave 2.
	Pasir Ris ↔ Kampong Bahru	2018	10 March	Extended to Kg Bahru Ter with the closure of New Bridge Rd Ter.
				First bus from Kg Bahru Ter brought forward to 0555 hrs on weekdays and Saturdays, and 0625 hrs on Sundays and Public Holidays.
			8 April	Serves new pair of bus stops after Somapah Rd and before Simei Rd along Upp Changi Rd East.
		2022	30 October	Temporarily amended to ply Pasir Ris St 11 and Pasir Ris St 12 with the partial closure of Pasir Ris Dr 1 to facilitate the construction of CR4Pasir Ris East station on the Cross Island Line.
		2025	9 March	Serves additional bus stop outside Outram Pk Stn Exit 4 along New Bridge Rd.

Service 13 (Current)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Bedok Rd ↔ Commonwealth Ave	1971	11 April	Introduced between Bedok Rd Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
			9 May	Amended to ply Upp Changi Rd, Changi Rd, Geylang Rd, Kallang Rd, Crawford St, Nth Bridge Rd and Stamford Rd.
(Current) Known as prior to 1 November 2001		1973	1 July	Operations transferred to Singapore Bus Services.
	Upp Changi Rd 8¼ ms ↔ Commonwealth Ave	1974	3 February	Amended to Upp Changi Rd 8¼ ms (13.3km) Ter under 1974 Bus Rationalisation.
			24 February	Amended to ply Grange Rd, Orchard Blvd and Paterson Rd towards Commonwealth Ave Ter with the conversion of Orchard Rd to one-way traffic.
	Upp Changi Rd Track 6 ↔ Commonwealth Ave		1 December	Shortened to Upp Changi Rd Track 6 Ter.
		1975	2 March	Amended to ply Sims Ave towards Upp Changi Rd 13.3 km Ter with the conversion of Geylang Rd to one-way traffic.
	Chai Chee ↔ Commonwealth Ave		16 November	Amended to Chai Chee Ter.
		1977	17 May	Amended to ply Commonwealth Ave Extension and Nth Buona Vista Rd towards Commonwealth Ave Ter.
	Chai Chee ↔ Ghim Moh		6 June	Extended to Ghim Moh Ter.
			19 June	Amended to ply Orchard Blvd and Grange Rd towards Ghim Moh Ter with the full conversion of Orchard Rd to one-way traffic.
		1979	14 October	Amended to ply Sims Ave East towards Chai Chee Ter with the conversion of Changi Rd to one-way traffic.
	Bedok ↔ Ghim Moh	1985	8 September	Extended to Bedok Int with the closure of Chai Chee Ter.
	Eunos ↔ Ghim Moh	1987	12 April	Shortened to Eunos Ter.
	Eunos ↔ Yio Chu Kang	1989	5 November	Amended to Yio Chu Kang Ter.
			10 December	Amended to Eunos Int.
		1990	2 September	Amended to ply Bishan St 22 and Marymount Rd, skipping Ang Mo Kio Ave 1.
		1996	TBC	Serves additional bus stop outside Kallang Stn along Sims Ave.
		1997		First bus from Eunos Int brought forward to 0545 hrs on weekdays and Saturdays.
				First bus from Yio Chu Kang Ter brought forward to 0535 hrs on weekdays.
	Marine Parade ↔ Yio Chu Kang	1998	30 March	Extended to Marine Parade Ter with the route amendment of Service 15.
	13Marine Parade ↔ Yio Chu Kang 13AYio Chu Kang → Sims Ave	2000	TBC	13AIntroduced from Yio Chu Kang Ter to Sims Ave (Eunos Stn) during morning peak hours on weekdays.
	13Yio Chu Kang ↺ Siglap Rd 13AYio Chu Kang → Sims Ave 13BYio Chu Kang → Siglap Rd	2001	16 September	Amended to loop at Siglap Rd with the closure of Marine Parade Ter.
				13BIntroduced from Yio Chu Kang Ter to Siglap Rd (Opp Mandarin Gdns), operating after the last bus of Service 13 daily.
	13Yio Chu Kang ↔ Upp East Coast 13AYio Chu Kang → Sims Ave		9 December	Extended to Upp East Coast Ter.
				13BDiscontinued.
	13Yio Chu Kang ↔ Upp East Coast	2002	TBC	13ADiscontinued.
		2003	TBC	Serves new pair of bus stops outside Potong Pasir Stn along Upp Serangoon Rd.
		2009	3 December	Designated wheelchair-accessible bus service (WAB).
	13Yio Chu Kang ↔ Upp East Coast 13AAng Mo Kio Ave 6 → Bishan Rd	2012	9 April	13AIntroduced from Ang Mo Kio Ave 6 (Aft Blk 304) to Bishan Rd (Bishan Stn) during morning peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.

Service 13A (1971 - 1974)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Bedok Road ↔ Commonwealth Avenue	1971	11 April	Introduced between Bedok Rd Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	3 February	Re-numbered Service 14 under 1974 Bus Rationalisation.

Service 14 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Bedok Rd ↔ Commonwealth Ave	1974	3 February	Re-numbered from Service 13A as a service between Bedok Rd Ter and Commonwealth Ave Ter under 1974 Bus Rationalisation.
			24 February	Amended to ply Grange Rd, Orchard Blvd and Paterson Rd towards Commonwealth Ave Ter with the conversion of Orchard Rd to one-way traffic.
	Upp Changi Rd 8¼ ms ↔ Commonwealth Ave		10 November	Amended to Upp Changi Rd 8¼ ms (13.3 km) Ter.
		1975	2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Upp Changi Rd 13.3 km Ter with the conversion of Geylang Rd to one-way traffic.
	Upp Changi Rd 8¼ ms ↔ Mei Chin Rd	1976	8 February	Shortened to Mei Chin Rd Ter.
		1977	19 June	Amended to ply Orchard Blvd and Grange Rd towards Mei Chin Rd with the full conversion of Orchard Rd to one-way traffic.
		1978	4 September	Amended to ply Nicoll Highway, skipping Sims Ave/Geylang Rd, Kallang Rd/Crawford St and Victoria St/Nth Bridge Rd.
		1979	21 May	Amended to ply Stadium Wk in both directions after 1930 hrs daily.
			TBC	Relocated to Upp Changi Rd 15.5km Ter.
	Upp Changi Rd 8¼ ms ↔ Jln Bt Merah		25 November	Integrated with Service 190, extended to Jln Bt Merah Ter and amended to ply Napier Rd, Holland Rd and Queensway, skipping Tanglin Rd, Alexandra Rd, Stirling Rd, Mei Chin Rd and Mei Ling St.
	Upp Changi Rd 8¼ ms ↔ Bukit Merah		23 December	Amended to Bt Merah Ctrl Ter.
	Somapah Depot ↔ Bukit Merah	1980	16 June	Amended to Somapah Depot.
			28 September	Amended to Bt Merah Int.
	Somapah ↔ Bukit Merah	1981	28 June	Amended to Somapah Int.
		1986	16 March	Amended to ply Stadium Wk permanently.
			13 April	Amended to ply Stadium Rd, skipping Stadium Wk.
			7 December	Serves new bus stop before Bedok Sth Ave 3 along Upp East Coast Rd.
	Changi Village ↔ Bukit Merah	1989	5 November	Extended to Changi Village Ter.
	Bedok ↔ Bukit Merah	1991	20 January	Shortened to Bedok Int under TransitLink Network Integration Exercise Phase 2.
		1992	29 March	Amended to ply Bt Merah Ctrl.
			19 July	Amended to ply Orchard Lk due to the closure of Grange Rd to facilitate road expansion works.
	Bedok ↔ Clementi	1993	23 May	Integrated with Service 92 and extended to Clementi Int under TransitLink Network Integration Exercise Phase 13, skipping Natl Stadium, Tanglin Rd/Orchard Blvd, Napier Rd, Holland Rd and Queensway.
		1994	29 May	Serves 2 new pairs of bus stops outside The Concourse, outside Golden Mile Twr and outside and opposite Suntec City along Nicoll Highway.
		1999	TBC	Skips temporarily closed bus stops outside and opposite Sch of Mechanical & Mfg along Commonwealth Ave West.
	14Bedok ↔ Clementi 14ABedok → Orchard Lk	2000		14AIntroduced from Bedok Int to Orchard Lk (Orchard Theatre) on Sundays and Public Holidays.
		2001	18 October	Serves reinstated bus stops outside Dover Stn along Commonwealth Ave West.
		2002	TBC	Serves new staggered bus stop outside Mutiara Crest along River Valley Rd, skipping the bus stop outside Mutiara View.
			7 July	Skips the bus stop opposite Mandarin Singapore along Orchard Rd.
		2004	20 April	Amended to ply Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd to facilitate reinstatement works for the collapsed Nicoll Highway.
			6 December	Amended to ply the reinstated Nicoll Highway, skipping Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd.
	14Bedok ↔ Clementi 14ABedok → Orchard Lk 14BBedok → Upper East Coast Rd		TBC	14BIntroduced from Bedok Int to Upp East Coast Rd (Landville Condo) during morning peak hours on weekdays.
		2005	12 June	Serves new bus stop outside Science Pk along AYE.
	14Bedok ↔ Clementi 14ABedok → Grange Rd 14BBedok → Upper East Coast Rd		2 July	Amended to ply Grange Rd with the partial closure of Somerset Rd.
				14AAmended to terminate at Grange Rd (Youth Pk) with the partial closure of Somerset Rd.
		2006	29 October	Amended to Clementi Temp Int.
		2007	TBC	Serves new pair of bus stops outside and opposite Blk 180 along Bedok Nth Rd.
		2008	14 July	Designated wheelchair-accessible bus service (WAB).
	14Bedok ↔ Clementi 14ABedok → Grange Rd	2011	TBC	14BDiscontinued.
			19 November	Amended to Bedok Temp Int.
			26 November	Amended to Clementi Integrated Transport Hub.
		2012	11 March	Serves new bus stop outside Blk 204 along Bedok Nth Int.
		2014	10 August	Serves new bus stop opposite Blk 2 along Mountbatten Rd.
			30 November	Amended to Bedok Integrated Transport Hub.
		2018	9 September	Amended to ply Nth Buona Vista Rd and Commonwealth Ave West, skipping Dover Rd and Dover Ave.
				14First bus from Clementi Int brought forward to 0540 hrs daily.
		2021	12 December	Serves new pair of bus stops before and after Heartbeat @ Bedok along Bedok Nth St 1.

Service 15

1st Generation (1975 - 1984)

Operator	Route	Year	Date	Service changes
	Marine Terrace ↔ Prince Edward	1975	22 June	Introduced between Marine Terr Ter and Prince Edward Ter.
		1976	15 February	Serves new staggered bus stop outside Overseas Union Finance along Robinson Rd.
			14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
	Marine Terrace ↺ Shenton Way		4 July	Extended to loop at Shenton Way from Marine Terr Ter.
		1977	27 March	Amended to ply Marine Terr and Marine Cres towards Shenton Way, and amended to ply Marine Cres and Marine Parade Rd towards Marine Terr Ter with the relocation of Marine Terr Ter opposite Blk 52.
		1978	13 November	Amended to ply Marine Parade Rd and Amber Rd, skipping Joo Chiat Rd and East Coast Rd.
		1979	11 February	Amended to ply the extended Shenton Way, Keppel Rd and Anson Rd, skipping Parsi Rd.
	Marine Parade ↺ Shenton Way	1981	5 July	Amended to Marine Parade Ter.
			11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
		1984	16 September	Integrated with Service 196 and discontinued.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	Pasir Ris ↔ Eunos	1995	10 September	Introduced between Pasir Ris Int and Eunos Int with the opening of Temasek Polytechnic.
	Pasir Ris ↺ Marine Parade Rd	1997	5 October	Integrated with Service M4 and extended to loop at Marine Parade Rd.
		1998	30 March	Amended to skip Marine Cres with the route extension of Service 13.
			TBC	Serves new pair of bus stops outside East Coast Apts and before St. Patrick's Rd along Telok Kurau Rd.
	15Pasir Ris ↺ Marine Parade Rd 15APasir Ris → Tampines Ave 1 15BJln Eunos → Kaki Bt Ave 1	2000	TBC	15AIntroduced as a short-trip service from Pasir Ris Int to Tampines Ave 1 (Temasek Poly West G) during morning peak hours on weekdays.
				15BIntroduced as a short-trip service from Jln Eunos (Eunos Stn) to Kaki Bt Ave 1 (Opp Blk 150) during morning peak hours on weekdays.
		2001	TBC	Serves new pair of bus stops outside and opposite Tropica Condo along Tampines Ave 1.
		2002	TBC	15First bus brought forward to 0545 hrs on weekdays and Saturdays.
		2007	8 October	15ADiscontinued.
				15BDiscontinued.
	15Pasir Ris ↺ Marine Parade Rd 15APasir Ris → Jln Eunos	2009	27 July	15AIntroduced from Pasir Ris Int to Jln Eunos (Opp Eunos Stn) during morning peak hours on weekdays.
			3 December	Designated wheelchair-accessible bus service (WAB).
		2011	28 August	Amended to ply Jln Tenaga, Bedok Reservoir Rd and Jln Damai with the partial closure of Kaki Bt Ave 1 to facilitate the construction of DT28Kaki Bukit station on the Downtown Line.
		2013	10 March	Serves additional bus stop opposite Blk 571 along Pasir Ris Dr 1.
		2016	24 April	Amended to ply the reinstated Kaki Bt Ave 1, skipping Jln Tenaga, Bedok Reservoir Rd and Jln Damai.
(Current)			18 September	Operations transferred to Go-Ahead Singapore.
		2021	11 April	Serves new pair of bus stops outside Blk 524B and opposite Blk 525B along Pasir Ris Dr 8.
			22 December	Amended to ply the realigned Tampines Ave 12, skipping Tampines Ave 9.
		2022	9 October	Serves new pair of bus stops before and opposite Blk 631B and outside Blk 637 CP along Tampines Ave 12.
			30 October	Serves new bus stop opposite Blk 638A along Tampines Ave 12.
			27 November	Serves new pair of bus stops outside and opposite HomeTeamNS Bedok along Bedok Nth Rd.

Service 16 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Marine Terrace ↔ Henderson Rd	1976	2 August	Introduced between Marine Terr Ter and Henderson Rd Ter.
		1977	27 March	Amended to ply Marine Terr and Marine Cres towards Henderson Rd Ter, and Marine Cres, Marine Parade Rd and Marine Terr towards Marine Terr Ter with the relocation of Marine Terr Ter opposite Blk 52.
	Marine Terrace ↔ Telok Blangah Heights		28 November	Extended to Telok Blangah Hts Ter.
		1979	21 May	Amended to ply Stadium Wk in both directions after 1930 hours daily.
	Marine Terrace ↔ Bukit Merah	1981	15 February	Amended to Bt Merah Int.
	Marine Parade ↔ Bukit Merah		5 July	Amended to Marine Parade Ter.
		1986	13 April	Amended to ply Stadium Rd, skipping Stadium Wk during the evening diversion into Kallang Pk/Natl Stadium.
		1987	23 February	Amended to Stadium Rd after 1845 hours daily.
		1992	19 July	Amended to ply Orchard Lk due to the closure of Grange Rd to facilitate road expansion works.
		1993	23 May	Amended to ply Stadium Rd permanently under TransitLink Network Integration Exercise Phase 13.
	Bukit Merah ↺ Changi Airport		5 December	Integrated with Service 149, extended to loop at Changi Airport and amended to ply Zion Rd/Kim Seng Rd, Outram Rd and Tiong Bahru Rd under TransitLink Network Integration Exercise Phase 14, skipping River Valley Rd, Delta Rd and Lower Delta Rd.
		1994	TBC	First bus brought forward to 0545 hrs daily.
			29 May	Serves 2 new pairs of bus stops outside The Concourse, outside Golden Mile Twr and outside and opposite Suntec City along Nicoll Highway.
	Bukit Merah ↔ Changi Airport	1996	TBC	Converted to bi-directional service between Bt Merah Int and Changi Airport PTB 1.
	Bukit Merah ↔ Marine Parade	1998	6 September	Shortened to Marine Parade Ter with the conversion of Service 36 to a full day trunk service.
	16Bukit Merah ↺ Siglap Rd 16ABukit Merah → Siglap Rd	2001	16 September	Amended to loop at Siglap Rd from Bt Merah Int with the closure of Marine Parade Ter.
				16AIntroduced from Bt Merah Int to Siglap Rd (Opp Mandarin Gdns), operating after the last bus of Service 16 daily.
		2002	8 February	Amended to ply Stadium Wk and Stadium Cres with the partial closure of Stadium Blvd to facilitate the construction of CC6Stadium station on the Circle Line.
			7 July	Skips the bus stop opposite Mandarin Singapore along Orchard Rd.
		2003	TBC	Serves new bus stop outside Victoria Sch along Marine Parade Rd.
		2004	20 April	Amended to ply Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd to facilitate reinstatement works for the collapsed Nicoll Highway.
			6 December	Amended to ply the reinstated Nicoll Highway, skipping Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd.
	16Bukit Merah ↺ Siglap Rd 16ABukit Merah → Marine Parade Rd	2005	25 April	16AExtended to terminate at Marine Parade Rd (Victoria Sch).
			2 July	Amended to ply Grange Rd with the partial closure of Somerset Rd.
	16Bukit Merah ↺ Siglap Rd 16ABukit Merah → Marine Parade Rd 16BBukit Merah → Bras Basah Rd		17 October	16BIntroduced from Bt Merah Int to Bras Basah Rd (Raffles Hotel) during morning peak hours on weekdays.
			30 October	Serves new bus stop outside Blk 94 along Zion Rd.
		2006	18 February	Amended to ply Stadium Cres with the full closure of Stadium Blvd to facilitate the construction of CC6Stadium station on the Circle Line.
			19 March	Amended to ply Cassia Lk, Cassia Cres, Guillemard Rd and Guillemard Camp Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction of CC8Dakota on the Circle Line.
	16Bedok ↔ Bukit Merah 16BBukit Merah → Bras Basah Rd	2007	19 August	Extended to Bedok Int.
				16ADiscontinued with the route extension of Service 16 to Bedok Int.
		2008	29 December	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Cassia Lk, Guillemard Rd and Guillemard Camp Rd.
		2010	29 September	Amended to ply Mountbatten Rd with the closure of Stadium Rd/Stadium Dr to facilitate the construction of the Singapore Sports Hub.
	Bedok ↔ Bukit Merah		TBC	16BDiscontinued.
		2011	19 November	Amended to Bedok Temp Int.
			3 December	Designated wheelchair-accessible bus service (WAB).
		2014	30 November	Amended to Bedok Integrated Transport Hub.
		2017	9 April	Amended to ply Still Rd Sth and East Coast Rd to facilitate the construction of TE26Marine Parade station on the Thomson–East Coast Line.
			12 November	Amended to ply the reinstated Marine Parade Rd and Joo Chiat Rd, skipping Still Rd Sth and East Coast Rd.

Service 16E (1994 - 1997)

Operator	Route	Year	Date	Service changes
	AMBukit Merah → Changi Airport PMChangi Airport → Bukit Merah	1994	31 January	Introduced between Bt Merah Int and Changi Airport as a peak hour uni-directional semi-express service on weekdays.
		1997	1 December	Re-numbered Service 36.

Service 17

1st Generation (1981 - 1984)

Operator	Route	Year	Date	Service changes
	Changi Point ↔ Prince Edward	1981	2 February	Introduced between Changi Pt Ter and Prince Edward Ter, operating on weekdays and Saturdays only.
			15 June	Amended to ply Loyang Ave and Loyang Way with the partial closure of Upp Changi Rd.
		1984	8 April	Discontinued.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	Pasir Ris ↔ Bedok	1993	4 April	Introduced between Pasir Ris Int and Bedok Int under TransitLink Network Integration Exercise Phase 12.
		1995	6 February	First bus from Pasir Ris Int brought forward to 0545 hrs daily.
				First bus from Bedok Int brought forward to 0545 hrs daily. Last bus from Bedok Int extended to 2335 hrs daily.
	Pasir Ris ↺ Bedok	2002	7 April	Converted to loop service between Pasir Ris Int and Bedok Int.
				Last bus from Pasir Ris Int extended to 0020 hrs daily.
	17Pasir Ris ↺ Bedok 17ABedok → Bedok North Ave 4	2006	17 April	17AIntroduced from Bedok Int to Bedok Nth Ave 4 (SBST Bedok Bus Pk) during peak hours on weekdays.
		2009	5 September	Serves new pair of bus stops outside Blk 231A CP and outside Blk 485 along Pasir Ris Dr 4.
		2011	27 June	Designated wheelchair-accessible bus service (WAB).
			19 November	Amended to loop at Bedok Temp Int.
	Pasir Ris ↺ Bedok	2014	16 November	17AConverted to a full day service between Bedok Nth Depot and Bedok Temp Int (Loop) under the LTA's Bus Service Enhancement Programme (BSEP).
			30 November	Amended to loop at Bedok Integrated Transport Hub.
(Current)	17Pasir Ris ↔ Bedok 17ABedok → Bedok North Ave 4	2016	18 September	Operations transferred to Go-Ahead Singapore. and reverted to bi-directional service.
				17Converted to a bi-directional service between Pasir Ris Int and Bedok Int. 17AConverted to a short trip service from Bedok Int to Bedok Nth Ave 4 (SBST Bedok Bus Pk).
		2017	21 October	Serves new pair of bus stops outside Tampines East Stn along Tampines Ave 2.
		2022	30 October	Temporarily amended to ply Pasir Ris St 11 and Pasir Ris St 12 with the partial closure of Pasir Ris Dr 1 to facilitate the construction of CR4Pasir Ris East station on the Cross Island Line.

Service 18 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001.	Bedok ↺ Tampines Ave 2	1982	2 May	Introduced between Bedok Int and Tampines Ave 2 (Loop).
	Bedok ↺ Tampines St 22	1985	3 November	Amended to loop at Tampines St 22 from Bedok Int.
	Tampines ↺ Bedok	1987	29 November	Extended to start from Tampines Int and loop at Bedok Int, skipping Tampines St 22.
		1988	25 January	First bus brought forward to 0515 hrs on weekdays and Saturdays.
		1999	TBC	Serves new pair of bus stops outside and opposite The Clearwater Condo along Bedok Reservoir Rd.
		2001	TBC	Serves new pair of bus stops opposite Blk 761 and opposite Baywater along Bedok Nth Ave 3.
		2006	TBC	Skips a pair of removed bus stops outside and opposite Bedok Green Sec Sch along Bedok Nth Ave 3.
		2011	7 March	Designated wheelchair-accessible bus service (WAB).
			19 November	Amended to loop at Bedok Temp Int and amended to ply Bedok Nth Rd and Bedok Nth Ave 2.
		2012	11 March	Serves new bus stop outside Blk 204 along Bedok Nth Int.
		2014	30 November	Amended to loop at Bedok Integrated Transport Hub.
	Tampines Concourse ↺ Bedok	2016	18 December	Extended to Tampines Concourse Int.
		2017	21 October	Amended to ply Tampines St 32, Tampines St 33 and Tampines St 34.
				First bus brought forward to 0505 hrs on weekdays and Saturdays, and 0535 hrs on Sundays and Public Holidays.
		2021	12 December	Serves new pair of bus stops before and after Heartbeat @ Bedok along Bedok Nth St 1.
	Tampines North ↔ Bedok North Depot	2022	27 November	Extended to Tampines Nth Int and Bedok Nth Depot and converted to bi-directional service.

Service 19

1st Generation (1979 - 1981)

Operator	Route	Year	Date	Service changes
	Siglap Rd ↔ Prince Edward	1979	TBC	Introduced between Siglap Rd and Prince Edward Ter.
	AMSiglap Rd → Prince Edward PMPrince Edward → Siglap Rd	1980	12 May	Converted to peak-hour one-directional service on weekdays and Saturdays only.
		1981	11 August	Discontinued.

2nd Generation (1988 - 1990)

Operator	Route	Year	Date	Service changes
	Bedok ↺ Pasir Ris Dr 6	1988	19 June	Introduced between Bedok Int and Pasir Ris Dr 6 (Loop).
	Bedok ↔ Pasir Ris	1989	10 December	Amended to Pasir Ris Int.
		1990	11 March	Integrated with Service 4 and discontinued.

3rd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Tampines ↺ Airport Cargo Rd	1994	23 January	Introduced between Tampines Int and Changi Airport Cargo Cplx (Loop) as a day service with the permanent amendment of Service 29 to loop at Changi Village Ter.
		2003	TBC	Serves new pair of bus stops outside and opposite Loyang Ind Est along Loyang Ave.
		2006	TBC	Last bus extended to 1945 hrs daily.
		2008	TBC	Serves new bus stop outside Changi Beach CP 2 along Nicoll Dr, skipping the bus stop opposite Changi Beach CP 2.
		2011	26 September	Designated wheelchair-accessible bus service (WAB).
		2013	TBC	Last bus extended to 2015 hrs daily.
		2023	26 February	Temporarily amended to ply the bus-only corridor along Loyang Ave and Loyang Way with the partial closure of Loyang Ave to facilitate the construction of Loyang Viaduct and CR3Loyang station on the Cross Island Line, skipping 3 pairs of bus stops along Loyang Ave.

Service 20

1st Generation (1971 - 1989)

Operator	Route	Year	Date	Service changes
Singapore Traction Company	Fidelio St ↔ Commonwealth Ave	1971	11 April	Introduced between Fidelio St Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
Associated Bus Services			6 December	Operations transferred to Associated Bus Services.
	Chai Chee ↔ Commonwealth Ave	1973	1 July	Operations transferred to Singapore Bus Services.
				Amended to Chai Chee Ter.
		1974	8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1975	2 March	Amended to ply Sims Ave towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
		1976	15 February	Serves new staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
	Chai Chee ↔ Ghim Moh	1977	7 March	Extended to Ghim Moh Ter.
			17 May	Amended to ply Commonwealth Ave Extension.
		1978	15 January	Amended to ply Jln Sultan, skipping Sumbawa Rd.
		1979	11 February	Amended to ply the extended Shenton Way towards Ghim Moh Ter, skipping Parsi Rd and Anson Rd.
			14 October	Amended to ply Sims Ave East towards Chai Chee Ter with the conversion of Changi Rd to one-way traffic.
		1981	11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
	Bedok ↔ Ghim Moh	1985	8 September	Extended to Bedok Int with the closure of Chai Chee Ter.
		1988	3 January	Serves new staggered bus stop opposite Treasury Bldg along Shenton Way, skipping the bus stop opposite Marina Hse.
		1989	5 November	Integrated with Service 100 and discontinued.

2nd Generation (1994 - 2000)

Operator	Route	Year	Date	Service changes
	Sims Pl ↺ St. Wilfred Rd	1994	17 October	Introduced between Sims Pl Ter and St. Wilfred Rd (Loop).
		2000	27 November	Integrated with Service 125 and discontinued.

3rd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current)	Tampines ↺ Changi Business Park Ctrl 2	2013	9 June	Introduced between Tampines Int and Changi Business Pk Ctrl 2 (Loop) under the LTA's Bus Service Enhancement Programme (BSEP), operating between 0600 hrs and 2330 hrs daily.
			30 September	Designated wheelchair-accessible bus service (WAB).
		2015	20 December	Serves new pair of bus stops outside and opposite Changi City Pt along Changi South Ave 2.
		2017	21 October	Amended to ply Somapah Rd and Changi Sth Ave 1, skipping Upp Changi Rd East and Xilin Ave.
		2018	10 June	Serves new pair of bus stops outside and opposite The Eightrium along Changi Sth Ave 1.
		2021	26 December	Serves new bus stop after Changi Business Park Crescent along Changi Business Pk Vista.
	20Tampines ↺ Changi Business Park Ctrl 2 20ASimei St 1 → Changi South Ave 1	2024	27 May	20AIntroduced from Simei St 1 (Blk 148) to Changi Sth Ave 1 (Expo Stn Exit B) during morning peak hours on Weekdays. Wheelchair-accessible bus service (WAB) at launch.

Service 21

1st Generation (1971 - 1981)

Operator	Route	Year	Date	Service changes
Amalgamated Bus Company	Fidelio St ↔ Delta	1971	11 April	Introduced between Fidelio St Ter and Delta Circus Ter under 1971 Bus Reorganisation.
	Fidelio St ↔ Commonwealth Ave		25 April	Extended to Commonwealth Ave Ter.
		1973	11 March	Amended to ply Zion Rd towards Commonwealth Ave Ter with the partial conversion of Kim Seng Rd to one-way traffic.
	Chai Chee ↔ Commonwealth Ave		1 July	Operations transferred to Singapore Bus Services.
				Amended to Chai Chee Ter.
		1975	2 February	Amended to ply Tiong Bahru Rd and the extended Zion Rd towards Commonwealth Ave Ter with the partial conversion of Kim Seng Rd and Outram Rd to one-way traffic.
			2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
		1977	17 May	Amended to ply Commonwealth Ave Extension and Nth Buona Vista Rd towards Commonwealth Ave Ter.
			29 August	Amended to ply Holland Ave, Holland Dr and Nth Buona Vista Rd towards Commonwealth Ave Ter.
		1981	15 November	Discontinued.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Pasir Ris ↔ Lor 1 Geylang	1992	29 November	Introduced between Pasir Ris Int and Lor 1 Geylang Ter under TransitLink Network Integration Exercise Phase 10.
	Pasir Ris ↔ St. Michael's	1993	23 May	Integrated with Service 4 and extended to St Michael's Ter under TransitLink Network Integration Exercise Phase 13.
		1994	TBC	Skips the bus stop outside Kallang Stn along Sims Ave.
		1999	TBC	Serves new pair of bus stops outside and opposite The Clearwater Condo along Bedok Reservoir Rd.
		2001	18 February	Serves new staggered bus stop outside Novena Stn along Thomson Rd, skipping the bus stop outside Novena Ch.
		2002	TBC	Serves new pair of bus stops opposite and between Blks 731 and 734 along Bedok Reservoir Rd.
		2003	21 June	Amended to ply Bendemeer Rd, Jln Besar, Kitchener Rd and Serangoon Rd under North East Line Rationalisation Phase 1.
		2004	27 April	Amended to ply Geylang Rd, Kallang Rd and Sims Ave towards St. Michael's Ter with the temporary conversion of Lor 1 Geylang to one-way traffic.
			6 December	Amended to ply the reinstated Lor 1 Geylang towards St. Michael's Ter, skipping Geylang Rd, Kallang Rd and Sims Ave.
		2006	26 June	Designated wheelchair-accessible bus service (WAB).
	21Pasir Ris ↔ St. Michael's 21AGeylang Rd → Kitchener Rd	2014	25 May	21AIntroduced from Geylang Rd (Bef Lor 18 Geylang) to Kitchener Rd (Bef Tai Hoe Hotel) on Sundays and Public Holidays. Wheelchair-accessible bus service (WAB) at launch.
		2016	24 April	Amended to ply Jln Tenteram in both directions.
		2022	30 October	Temporarily amended to ply Pasir Ris St 11 and Pasir Ris St 12 with the partial closure of Pasir Ris Dr 1 to facilitate the construction of CR4Pasir Ris East station on the Cross Island Line.

Service 22

1st Generation (1971 - 1984)

Operator	Route	Year	Date	Service changes
Amalgamated Bus Company	Fidelio St ↔ Labrador	1971	11 April	Introduced between Fidelio St Ter and Alexandra Rd Ter.
	Fidelio St ↔ Tg Berlayer	1972	TBC	Extended to Tg Berlayer Ter.
	Chai Chee ↔ Tg Berlayer	1973	1 July	Operations transferred to Singapore Bus Services.
				Amended to Chai Chee Ter.
		1974	3 February	Amended to skip Fidelio St under 1974 Bus Rationalisation.
		1975	2 February	Amended to ply new slip road from Tiong Bahru Rd to Outram Rd with the conversion of Seng Poh Rd to one-way traffic.
			2 March	Amended to ply Sims Ave towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
		1979	14 October	Amended to ply Sims Ave East towards Chai Chee Ter with the conversion of Changi Rd to one-way traffic.
		1984	22 April	Discontinued.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Ang Mo Kio ↔ Tampines	1988	24 January	Introduced between Ang Mo Kio Int and Tampines Int.
		1999	TBC	Serves new pair of bus stops outside and opposite The Clearwater Condo along Bedok Reservoir Rd.
		2002	24 March	Amended to Ang Mo Kio Temp Int.
				First bus from Ang Mo Kio Temp Int revised to 0530 hrs on weekdays and Saturdays.
			TBC	Serves new pair of bus stops opposite and between Blks 731 and 734 along Bedok Reservoir Rd.
		2003	21 June	Amended to ply Serangoon Ctrl and Upp Serangoon Rd under North East Line Rationalisation Phase 1.
			TBC	Serves new bus stop outside Serangoon Stn along Serangoon Ctrl.
		2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
		2011	7 March	Designated wheelchair-accessible bus service (WAB).
		2013	22 September	Serves new bus stop outside Wisma AUPE along Upp Paya Lebar Rd.
		2017	12 February	Serves new pair of bus stops before and after Ubi Rd 3 along Ubi Ave 2.
				Serves additional pair of bus stops outside and opposite Our Tampines Hub along Tampines Ave 5.
	Ang Mo Kio ↔ Eunos	2021	12 December	Shortened to Eunos Int under Downtown Line 3 Rationalisation.

Service 23 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Tampines ↺ Orchard Rd	1983	20 February	Introduced between Tampines Ter and Orchard Rd (Loop).
		1987	29 November	Amended to Tampines Int.
		1988	23 October	Skips a pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	Tampines ↺ Rochor Canal Rd	1991	6 January	Shortened to loop at Rochor Canal Rd under TransitLink Network Integration Exercise Phase 1.
		1995	18 September	Amended to ply Tampines Ave 1, Tampines Ave 10 and Bedok Nth Rd with the opening of Temasek Polytechnic.
		1997	TBC	Serves additional pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
		2001	TBC	Serves new pair of bus stops outside and opposite Tropica Condo along Tampines Ave 1.
	23Tampines ↺ Rochor Canal Rd 23ATampines → Tampines Ave 1	2006	28 August	23AIntroduced from Tampines Int to Tampines Ave 1 (Temasek Poly West G) during morning peak hours on weekdays.
		2007	TBC	Serves new pair of bus stops outside Kallang Basin Swim Cplx and after Infineon along Jln Kolam Ayer.
	Tampines ↺ Rochor Canal Rd	2010	TBC	23ADiscontinued.
		2017	21 August	Designated wheelchair-accessible bus service (WAB).
			21 October	Serves new bus stop outside Bedok Nth Stn along Bedok Nth Rd.
		2022	3 April	Serves additional bus stop outside Jln Besar Stn Exit A along Jln Besar.
			27 November	Serves new pair of bus stops outside and opposite HomeTeamNS Bedok along Bedok Nth Rd.

Service 24 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Ang Mo Kio ↺ Changi Airport	1983	25 June	Introduced between Ang Mo Kio Int and Changi Airport PTB (Loop) with the merger of SBS Services 392, 394 and SSB Service 727 under Changi Airport Bus Plan 1983.
		1986	6 July	Serves the bus stop outside Blk 416 along Sims Ave, skipping the bus stop outside Blk 414.
		1990	13 October	Amended to serve Changi Airport PTB 2.
	Ang Mo Kio ↔ Changi Airport	1996	TBC	Converted to bi-directional service between Ang Mo Kio Int and Changi Airport PTB 1.
		2000	TBC	Serves new pair of bus stops outside and opposite SATS Flight Kitchen along Airport Blvd.
	24Ang Mo Kio ↔ Changi Airport 24AAng Mo Kio → New Upp Changi Rd	2002	24 February	24AIntroduced as a full day short-trip service from Ang Mo Kio Int to New Upp Changi Rd (Tanah Merah Stn), operating as alternate trips of Service 24.
			24 March	Amended to Ang Mo Kio Temp Int.
		2003	16 March	Amended to ply Eunos Ave 5 and Eunos Rd 8 with the partial closure of Paya Lebar Rd to facilitate the construction of CC9EW8Paya Lebar station on the Circle Line.
	Ang Mo Kio ↔ Changi Airport	2004	TBC	24ADiscontinued.
		2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
			11 November	Amended to serve Changi Airport PTB 3.
		2009	23 August	Amended to ply the reinstated Paya Lebar Rd, skipping Eunos Ave 5 and Eunos Rd 8.
		2010	2 December	Designated wheelchair-accessible bus service (WAB).
	Ang Mo Kio ↺ Changi Airport	2012	9 January	Converted to loop service between Ang Mo Kio Int and Changi Airport PTB 2.
		2013	22 September	Serves new bus stop outside Wisma AUPE along Upp Paya Lebar Rd.
		2017	22 October	Amended to serve Changi Airport PTB 4.
		2018	8 April	Serves new pair of bus stops after Somapah Rd and before Simei Rd along Upp Changi Rd East.

Service 25 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Ang Mo Kio ↔ Bedok	1979	28 October	Introduced between Ang Mo Kio Ave 3 Ter and Bedok Int.
		1980	1 June	Amended to ply Boundary Rd and Upp Paya Lebar Rd, skipping Lor Chuan, Braddell Rd and Bartley Rd.
		1981	5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
		1983	10 April	Amended to Ang Mo Kio Int.
		1985	7 July	Amended to ply Ang Mo Kio Ave 3, Hougang Ave 2, Hougang Ave 3, Eunos Lk and Jln Eunos, skipping Ang Mo Kio Ave 8, Ang Mo Kio Ave 1, Boundary Rd, Upp Paya Lebar Rd and Paya Lebar Rd.
		1994	TBC	First bus from Ang Mo Kio Int brought forward to 0530 hrs on Sundays and Public Holidays.
	25Ang Mo Kio ↔ Bedok 25AAng Mo Kio → Hougang Ave 3	2000		25AIntroduced from Ang Mo Kio Int to Hougang Ave 3 (Aft Kim Chuan Rd) during morning peak hours on weekdays.
		2002	24 March	Amended to Ang Mo Kio Temp Int.
			TBC	25First bus from Bedok Int brought forward to 0515 hrs on weekdays and Saturdays, and 0530 hrs on Sundays and Public Holidays.
	Ang Mo Kio ↔ Bedok	2003		25ADiscontinued.
		2005	19 February	Serves additional pair of bus stops outside Jubilee and opposite Blk 710 along Ang Mo Kio Ave 8.
		2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
		2011	19 November	Amended to Bedok Temp Int.
		2012	26 March	Designated wheelchair-accessible bus service (WAB).
		2014	30 November	Amended to Bedok Integrated Transport Hub.
	Ang Mo Kio ↔ Upp East Coast	2017	9 April	Extended to Upp East Coast Ter, skipping Bedok Int.

Service 26 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Bedok ↺ Geylang Bahru	1981	12 July	Introduced between Bedok Int and Geylang Bahru (Loop).
		1986	21 July	Last bus extended to 2330 hrs daily.
	Bedok ↔ Toa Payoh	1989	27 August	Integrated with Service 148 and extended to Toa Payoh Int.
			19 November	Serves new bus stop outside Kallang Stn along Sims Ave.
		1994	5 March	Amended to ply Kim Keat Link and Lor 6 Toa Payoh towards Toa Payoh Int.
			11 July	Amended to ply Jln Kolam Ayer, Bendemeer Rd, Whampoa Nth and Serangoon Rd.
			TBC	Skips the bus stop outside Kallang Stn along Sims Ave.
		1998	31 May	Amended to Toa Payoh Temp Int.
				Serves new pair of bus stops outside and opposite Toa Payoh Swim Cplx along Lor 6 Toa Payoh.
		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
		2003	4 May	Amended to ply Geylang Bahru, Bendemeer Rd, Whampoa East and Serangoon Rd, skipping Jln Kolam Ayer and Whampoa Nth.
		2004	27 April	Amended to ply Geylang Rd, Kallang Rd and Sims Ave towards Toa Payoh Int with the temporary conversion of Lor 1 Geylang to one-way traffic.
			6 December	Amended to ply the reinstated Lor 1 Geylang towards Toa Payoh Int, skipping Geylang Rd, Kallang Rd and Sims Ave.
		2005	TBC	Serves an additional bus stop outside City Plaza along Geylang Rd.
		2011	19 November	Amended to Bedok Temp Int.
		2014	23 March	Designated wheelchair-accessible bus service (WAB).
			30 November	Amended to Bedok Integrated Transport Hub.
		2016	12 June	Amended to ply Chai Chee St and Chai Chee Dr, skipping New Upp Changi Rd.

Service 27 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Tampines ↺ Changi Airport	1988	24 January	Introduced between Tampines Int and Changi Airport PTB (Loop).
			23 October	Skips a pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
		1990	13 October	Amended to serve Changi Airport PTB 2.
	Pasir Ris ↺ Changi Airport	1992	29 November	Extended to Pasir Ris Int under TransitLink Network Integration Exercise Phase 10.
		1993	24 January	Amended to serve Tampines Int in both directions.
		1994	16 January	Amended to ply Pasir Ris St 52 and Pasir Ris Dr 1, skipping Pasir Ris Ctrl.
	Tampines ↺ Changi Airport	1995	10 September	Shortened to Tampines Int with the introduction of Service 15.
	Tampines ↔ Changi Airport	1996	TBC	Converted to bi-directional service between Tampines Int and Changi Airport PTB 1.
			TBC	First bus from Tampines Int brought forward to 0545 hrs on Sundays and Public Holidays.
		1997	TBC	Serves additional pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	Sengkang ↔ Changi Airport	1999	25 July	Extended to Sengkang Ter.
			TBC	Serves reinstated bus stop outside Blk 298A along Punggol Rd.
		2000	TBC	Serves new pair of bus stops outside and opposite SATS Flight Kitchen along Airport Blvd.
			TBC	Serves 2 new pairs of bus stops outside and opposite Tampines Dormitory and before and after Tampines Ind Ave 5 along Tampines Ave 10.
			TBC	Serves reinstated bus stop outside Blk 190C along Punggol Rd.
		2001	28 April	Amended to Sengkang Temp Int.
		2002	TBC	Serves new pair of bus stops before and after Tampines Ave 9 along Tampines Ave 10.
	Hougang Ctrl ↔ Changi Airport		29 December	Extended to Hougang Ctrl Int.
	27Hougang Ctrl ↔ Changi Airport 27ACompassvale Rd → Tampines Ave 5		30 December	27AIntroduced from Compassvale Rd (Opp Blk 240) to Tampines Ave 5 (Blk 147) during morning peak hours on weekdays.
		2003	TBC	Serves new pair of bus stops before and after TPE along Tampines Ave 10.
	27Hougang Ctrl ↔ Changi Airport 27ACompassvale Rd → Tampines Ave 5 27BTampines Ave 5 → Compassvale Rd	2007	26 March	27BIntroduced from Tampines Ave 5 (Blk 938) to Compassvale Rd (Blk 240) during evening peak hours on weekdays.
			11 November	Amended to serve Changi Airport PTB 3.
	27Hougang Ctrl ↔ Changi Airport 27ACompassvale Rd → Tampines Ave 5	2008	TBC	27BDiscontinued.
	27Hougang Ctrl ↔ Changi Airport 27ASengkang East Ave → Tampines Ave 4	2009	17 August	27AExtended to start from Sengkang East Ave (Blk 203B) and shortened to terminate at Tampines Ave 4 (Opp Century Sq).
			26 October	Designated wheelchair-accessible bus service (WAB).
	27Hougang Ctrl ↺ Changi Airport 27ASengkang East Ave → Tampines Ave 4	2012	9 January	27Converted to loop service between Hougang Ctrl Int and Changi Airport PTB 2.
		2014	24 August	Serves new pair of bus stops before and after Punggol Rd along TPE.
		2015	8 November	Serves new pair of bus stops outside and opposite CityLife @ Tampines along Tampines Ave 9.
		2017	11 September	27Last bus extended to 2350 hrs daily.
		2022	28 August	Temporarily amended to ply Hougang Ave 4 and Hougang Ave 10 with the partial closure of Hougang Ctrl to facilitate the construction of CR8NE14Hougang on the Cross Island Line.
		2024	27 May	27First bus brought forward to 0510 hrs on weekdays.

Service 28

1st Generation (1983 - 1992)

Operator	Route	Year	Date	Service changes
	Tampines ↺ New Bridge Rd	1983	4 September	Introduced between Tampines Ter and New Bridge Rd (Loop).
	Tampines ↔ New Bridge Rd	1987	3 May	Amended to terminate at New Bridge Rd Ter.
			6 June	Amended to the relocated New Bridge Rd Ter.
			27 September	Amended to ply the extended Eu Tong Sen St towards Tampines Ave 5 Ter to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Tampines Ave 5 Ter to facilitate the second stage of road expansion along New Bridge Rd.
			29 November	Amended to Tampines Int.
			13 December	Serves new staggered bus stop opposite Peninsula Plaza along Nth Bridge Rd, skipping the bus stop outside St Andrew's Cath.
		1988	20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
			23 October	Skips a pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
		1990	22 July	Serves additional bus stop outside Ellenborough Mkt along Eu Tong Sen St.
		1992	29 November	Integrated with Service 2 and discontinued under TransitLink Network Integration Exercise Phase 10.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Tampines ↺ Bedok	1994	2 October	Introduced between Tampines Int and Bedok Int (Loop).
		1999	TBC	Serves new pair of bus stops outside and opposite The Clearwater Condo along Bedok Reservoir Rd.
	Tampines ↔ Toa Payoh	2000	29 October	Integrated with Service 152 and extended to Toa Payoh Int, skipping Bedok Nth St 1 and Bedok Int.
		2001	TBC	Serves new pair of bus stops opposite Blk 761 and opposite Baywater along Bedok Nth Ave 3.
		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
		2003	16 March	Amended to ply Eunos Ave 5 and Eunos Rd 8 with the partial closure of Paya Lebar Rd to facilitate the construction of CC9EW8Paya Lebar station on the Circle Line.
			23 March	Amended to ply Tampines St 45, Tampines St 34 and Tampines St 32.
				First bus from Tampines Int brought forward to 0540 hrs daily. First bus from Toa Payoh Int brought forward to 0555 hrs daily.
		2006	TBC	Skips a pair of removed bus stops outside and opposite Bedok Green Sec Sch along Bedok Nth Ave 3.
		2009	8 March	Skips a pair of bus stops outside and opposite Bartley Sec Sch with the realignment of the junction of Upp Paya Lebar Rd and Bartley Rd.
			23 August	Amended to ply the reinstated Paya Lebar Rd, skipping Eunos Ave 5 and Eunos Rd 8.
		2010	13 February	Serves new pair of bus stops outside and opposite Blk 220 CP along Bedok Nth Ave 3.
		2015	28 September	Designated wheelchair-accessible bus service (WAB).

Service 29 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Tampines ↺ Changi AirFreight Ctr	1985	9 June	Introduced between Tampines Ter and Changi Airport Cargo Cplx (Loop).
		1987	26 April	Integrated with Services 210 and 218 and amended to ply Cranwell Rd, Netheravon Rd and Changi Village Rd.
			29 November	Amended to Tampines Int.
		1992	29 November	Amended to loop at Changi Village Ter after 1930 hours daily under TransitLink Network Integration Exercise Phase 10.
	Tampines ↺ Changi Village	1994	23 January	Amended to loop at Changi Village Ter throughout the day.
		2002	TBC	Serves new pair of bus stops outside and opposite Changi Chapel Museum along Upp Changi Rd Nth.
		2003	23 March	Amended to ply Tampines St 41 and Tampines Ave 9.
				First bus brought forward to 0520 hrs daily. Last bus extended to 2345 hrs daily.
		2010	28 February	Designated wheelchair-accessible bus service (WAB).
	29Tampines ↺ Changi Village 29ATampines → Tampines Ave 7	2013	4 March	29AIntroduced from Tampines Int to Tampines Ave 7 (Blk 497D) during evening peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.

Service 30/30A (1971 - 1974)

Operator	Route	Year	Date	Service changes
Singapore Traction Company	Changi Rd ↔ Prince Edward	1971	11 April	Introduced between Changi Rd Ter and Prince Edward Ter under 1971 Bus Reorganisation.
	Changi Rd ↔ Intl Rd		2 May	Extended to Intl Rd Ter.
Associated Bus Services			6 December	Operations transferred to Associated Bus Services.
	Changi Rd ↔ Jln Ahmad Ibrahim	1972	24 December	Amended to Jln Ahmad Ibrahim Ter.
	Chai Chee ↔ Jln Ahmad Ibrahim	1973	1 July	Operations transferred to Singapore Bus Services.
				Amended to Chai Chee Ter.
		1974	3 February	Amended to skip Stamford Rd, Waterloo St and Bras Basah Rd and re-numbered Service 30 under 1974 Bus Rationalisation.

Service 30 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Chai Chee ↔ Jln Ahmad Ibrahim	1974	3 February	Re-numbered from Service 30/30A as a service between Chai Chee Ter and Jln Ahmad Ibrahim Ter.
			8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1976	15 February	Serves new staggered bus stop outside Overseas Union Finance along Robinson Rd.
	Chai Chee ↔ Jurong	1978	1 June	Extended to Jurong Int.
		1979	11 February	Amended to ply the extended Shenton Way towards Jurong Int, skipping Parsi Rd and Anson Rd.
	Bedok ↔ Jurong		25 February	Amended to Bedok Int.
			14 October	Amended to ply Still Rd and Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way traffic, skipping Telok Kurau Rd.
			25 November	Amended to ply Sims Ave/Geylang Rd and Tg Katong Rd, skipping Telok Kurau Rd/Still Rd, Joo Chiat Pl and Joo Chiat Rd.
		1981	11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
		1982	24 May	Amended to ply West Coast Highway.
		1988	3 January	Serves new staggered bus stop opposite Treasury Bldg along Shenton Way, skipping the bus stop opposite Marina Hse.
	Bedok ↔ Boon Lay	1990	1 July	Extended to Boon Lay Int and amended to ply Teban Gdns Rd towards Boon Lay Int.
		1992	28 June	Amended to ply Mountbatten Rd, Fort Rd and ECP under TransitLink Network Integration Exercise Phase 8, skipping Nicoll Highway and Shenton Way.
		1996	TBC	Skips a pair of removed bus stops outside and opposite MOE Water Works along Jln Ahmad Ibrahim.
		1999	20 September	Serves new pair of bus stops outside and opposite West Bay Resort Condo along West Coast Rd.
			TBC	Skips a pair of removed bus stops outside and opposite Wishart Rd along Telok Blangah Rd.
	30Bedok ↔ Boon Lay 30ABedok → Fort Rd	2000		30AIntroduced from Bedok Int to Fort Rd (Opp Fort Gdns) during morning peak hours on weekdays.
		2001		Amended to ply West Coast Rd and Penjuru Rd with the partial closure of Teban Gdns Rd.
		2002		Skips removed bus stop opposite ITE Pasir Panjang along Telok Blangah Rd.
				30First bus from Boon Lay Int brought forward to 0530 hrs on weekdays and Saturdays, and 0545 hrs on Sundays and Public Holidays.
		2003	16 March	Amended to ply Geylang Rd, Paya Lebar Rd and Sims Ave with the partial closure of Tg Katong Rd to facilitate the construction of CC9EW8Paya Lebar station on the Circle Line.
			TBC	Serves new bus stop outside Shell Kiosk along Tg Katong Rd.
		2004		30Last bus from Bedok Int extended to 2335 hrs daily.
	30Bedok ↔ Boon Lay 30ABedok → Fort Rd 30BBoon Lay → Telok Blangah Rd		29 March	30BIntroduced from Boon Lay Int to Telok Blangah Rd (Opp HarbourFront Ctr) during morning peak hours on weekdays.
		2006	19 March	Amended to ply Cassia Lk, Cassia Cres, Guillemard Rd and Guillemard Camp Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction of CC8Dakota station on the Circle Line.
			18 June	Amended to Boon Lay Temp Int.
			29 October	Serves new bus stop outside VivoCity along Telok Blangah Rd.
	30Bedok ↔ Boon Lay 30BBoon Lay → Telok Blangah Rd	2007	3 January	30ADiscontinued.
		2008	7 December	Skips removed bus stop opposite Temenggong D Mque along Telok Blangah Rd.
			29 December	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Cassia Lk, Guillemard Rd and Guillemard Camp Rd.
		2009	4 October	Amended to ply the reinstated Tg Katong Rd, skipping Geylang Rd, Paya Lebar Rd and Sims Ave.
			27 December	Amended to Boon Lay Integrated Transport Hub.
	Bedok ↔ Boon Lay	2010	TBC	30BShort-Trip 30B discontinued.
		2011	19 November	Amended to Bedok Temp Int.
			3 December	Designated wheelchair-accessible bus service (WAB).
		2013	29 December	Amended to ply MCE with the partial closure of ECP.
		2014	30 November	Amended to Bedok Integrated Transport Hub.
		2023	8 January	Amended to ply realigned Teban Gdns Rd with the permanent partial closure of Teban Gdns Rd to facilitate the construction of JE7Pandan Reservoir station on the Jurong Region Line, serving an additional bus stop before Teban Gdns Rd along Jurong Town Hall Rd.

Service 31/31A (1971 - 1974)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Changi Rd ↔ Prince Edward	1971	11 April	Introduced between Changi Rd Ter and Prince Edward Ter under 1971 Bus Reorganisation.
	Changi Rd ↺ Outram Pk		9 May	Extended to loop at Outram Pk.
	Chai Chee ↺ Outram Pk	1973	1 July	Operations transferred to Singapore Bus Services.
				Amended to Chai Chee Ter.
		1974	3 February	Amended to New Bridge Rd Ter and re-numbered Service 31 under 1974 Bus Rationalisation.

Service 31

1st Generation (1974 - 1976)

Operator	Route	Year	Date	Service changes
	Chai Chee ↔ New Bridge Rd	1974	3 February	Re-numbered from Service 31 between Chai Chee Ter and New Bridge Rd Ter under 1974 Bus Rationalisation.
		1975	2 February	Amended to ply new slip road from Tiong Bahru Rd to Outram Rd with the conversion of Seng Poh Rd to one-way traffic.
			2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
		1976	2 August	Discontinued.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Bedok ↺ Kallang Pk/Natl Stadium	1979	27 May	Introduced between Bedok Int and Stadium Wk (Loop).
		1980	23 July	Amended to ply Bedok Sth Rd, skipping Bedok Sth Ave 1.
			31 August	Amended to ply Marine Parade Rd and Amber Rd, skipping Karikal Rd and East Coast Rd.
	Tampines ↺ Kallang Pk/Natl Stadium	1985	7 April	Extended to Tampines Ter.
		1986	13 April	Amended to ply Stadium Rd, skipping Stadium Wk.
		1987	29 November	Amended to Tampines Int.
		1988	23 October	Skips a pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	Tampines ↔ Toa Payoh	1993	5 December	Integrated with Service 149 and extended to Toa Payoh Int under TransitLink Network Integration Exercise Phase 14, skipping Stadium Rd.
		1994	5 March	Amended to ply Kim Keat Lk and Lor 6 Toa Payoh towards Toa Payoh Int.
			TBC	Skips the bus stop outside Kallang Stn along Sims Ave.
		1997	TBC	Serves additional pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
		1998	31 May	Amended to Toa Payoh Temp Int.
				Serves new pair of bus stops outside and opposite Toa Payoh Swim Cplx along Lor 6 Toa Payoh.
		1999	TBC	Last bus from Toa Payoh Temp Int extended to 2335 hrs on weekdays.
		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
		2004	27 April	Amended to ply Geylang Rd, Kallang Rd and Sims Ave towards Toa Payoh Int with the temporary conversion of Lor 1 Geylang to one-way traffic.
			6 December	Amended to ply the reinstated Lor 1 Geylang towards Toa Payoh Int, skipping Geylang Rd, Kallang Rd and Sims Ave.
	31Tampines ↔ Toa Payoh 31ATampines → New Upp Changi Rd	2005	10 January	31AIntroduced from Tampines Int to New Upp Changi Rd (Tanah Merah Stn) during morning peak hours on weekdays.
			5 June	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
			26 June	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.
		2006	19 March	Amended to ply Cassia Lk, Cassia Cres, Guillemard Rd and Guillemard Camp Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction of CC8Dakota station on the Circle Line.
			TBC	Serves additional bus stop outside Victoria Sch along Marine Parade Rd.
		2008	29 December	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Cassia Lk, Guillemard Rd and Guillemard Camp Rd.
		2015	22 June	Designated wheelchair-accessible bus service (WAB).

Service 32 (Current)

Operator	Route	Year	Date	Service changes
Amalgamated Bus Company	Changi Rd ↺ Mei Chin Rd	1971	11 April	Introduced between Changi Rd Ter and Mei Chin Rd (Loop) under 1971 Bus Reorganisation.
			28 September	Amended to ply the extended Ganges Ave towards Changi Rd Ter.
		1972	11 June	Amended to ply the extended Upp Cross St with the partial conversion of Havelock Rd to one-way traffic, skipping New Bridge Rd.
(Current) Known as prior to 1 November 2001	Chai Chee ↺ Mei Chin Rd	1973	1 July	Operations transferred to Singapore Bus Services.
				Extended to Chai Chee Ter.
		1975	2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
	Chai Chee ↔ Mei Chin Rd	1976	8 February	Amended to Mei Chin Rd Ter.
	Bedok ↔ Mei Chin Rd	1979	7 May	Extended to Bedok Int.
			14 October	Amended to ply Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way traffic.
			11 November	Amended to ply Ganges Ave towards Mei Chin Rd with the realignment of Delta Circus.
	Bedok ↺ Upp Cross St		25 November	Shortened to loop at Upp Cross St from Bedok Int.
		1980	11 May	Amended to ply Eu Tong Sen St and Canal Rd, skipping New Bridge Rd.
		1987	27 September	Amended to ply the extended Eu Tong Sen St towards Bedok Int to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Bedok Int to facilitate the second stage of road expansion along New Bridge Rd.
			13 December	Serves new staggered bus stop opposite Peninsula Plaza along Nth Bridge Rd, skipping the bus stop outside St Andrew's Cath.
	Bedok ↔ Buona Vista	1988	23 October	Extended to Buona Vista Ter.
		1990	10 June	Amended to ply Nth Boat Quay, skipping Sth Bridge Rd, Nth Canal Rd and Eu Tong Sen St.
		1992	29 March	Amended to ply Lower Delta Rd and Tiong Bahru Rd under TransitLink Network Integration Exercise Phase 6, skipping Alexandra Rd.
		1997	TBC	Serves new bus stop outside The Buddhist Union along Sims Ave East.
		1999	TBC	Serves the bus stop outside Bugis Stn along Victoria St, skipping the bus stop opposite Bugis Junction.
		2005	5 June	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
			26 June	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.
		2006	19 March	Amended to ply Cassia Lk, Cassia Cres, Guillemard Rd and Guillemard Camp Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction of CC8Dakota station on the Circle Line.
		2008	29 December	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Cassia Lk, Guillemard Rd and Guillemard Camp Rd.
		2011	19 November	Amended to Bedok Temp Int.
		2012	3 December	Designated wheelchair-accessible bus service (WAB).
		2014	30 November	Amended to Bedok Integrated Transport Hub.
		2016	6 March	Amended to ply Tanglin Rd and Kay Siang Rd with the partial closure of Margaret Dr.
		2021	22 August	Serves merged bus stop outside Blk 30 along Margaret Dr, skipping the bus stop opposite Queenstown Lib and outside The Fisherman Ch.

Service 33 (Current)

Operator	Route	Year	Date	Service changes
Amalgamated Bus Company	Changi Rd ↔ Clementi Rd	1971	11 April	Introduced between Changi Rd Ter and Clementi Rd Ter under 1971 Bus Reorganisation.
	Changi Rd ↔ Pasir Panjang Rd		19 May	Amended to Pasir Panjang Rd Ter.
(Current) Known as prior to 1 November 2001	Chai Chee ↔ Pasir Panjang Rd	1973	1 July	Operations transferred to Singapore Bus Services.
				Extended to Chai Chee Ter.
	Upp Changi Rd Track 6 ↔ Pasir Panjang Rd	1974	1 December	Extended to Upp Changi Rd Track 6 Ter.
		1975	2 February	Amended to ply new slip road from Tiong Bahru Rd to Outram Rd with the conversion of Seng Poh Rd to one-way traffic.
			2 March	Amended to ply Sims Ave towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
	Chai Chee ↔ Pasir Panjang Rd	1978	13 March	Amended to Chai Chee Ter.
		1979	14 October	Amended to ply Still Rd and Sims Ave East towards Chai Chee Ter with the conversion of Changi Rd to one-way traffic, skipping Telok Kurau Rd.
			14 November	Amended to ply Telok Kurau Rd, skipping Still Rd.
	Chai Chee ↔ Kent Ridge	1981	5 July	Amended to Kent Ridge Ter.
	Bedok ↔ Kent Ridge	1985	15 September	Extended to Bedok Int and amended to ply Dunman Rd, Old Airport Rd and Mountbatten Rd.
		1986	1 June	Skips removed bus stop before Ayer Rajah Rd along Clementi Rd.
		1987	6 April	Skips removed bus stop before College Rd along Outram Rd.
			27 September	Amended to ply the extended Eu Tong Sen St towards Bedok Int to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St to facilitate the second stage of road expansion along New Bridge Rd.
			13 December	Serves new staggered bus stop opposite Peninsula Plaza along Nth Bridge Rd, skipping the bus stop outside St Andrew's Cath.
		1988	11 January	Serves merged bus stop along Ayer Rajah Rd.
			20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
			29 May	Amended to ply Buona Vista Flyover with the opening of the Ayer Rajah Expressway (AYE), skipping Portsdown Rd.
		1990	22 July	Serves additional bus stop outside Ellenborough Mkt along Eu Tong Sen St.
		1993	11 April	Amended to ply Jln Sultan, Victoria St and Hill St, skipping Sth Bridge Rd and Upp Cross St.
		1994	3 July	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, Nth Bridge Rd and Jln Sultan.
		1995	1 April	Amended to ply Tembeling Rd towards Bedok Int with the partial conversion of Joo Chiat Rd to one-way traffic.
		1996	TBC	Skips a removed bus stop before Joo Chiat Pl along Joo Chiat Rd.
		1997	TBC	Serves the bus stop outside Bugis Stn along Victoria St, skipping the bus stop opposite Bugis Junction.
			7 December	Amended to ply Upp Pickering St, Sth Bridge Rd, Neil Rd and Cantonment Rd with the partial closure of New Bridge Rd to facilitate the construction of NE4DT19Chinatown station on the North East Line.
		1998	TBC	First bus from Bedok Int brought forward to 0545 hrs on weekdays, and 0550 hrs on Saturdays.
		2002	20 April	Amended to ply the reinstated New Bridge Rd, skipping Upp Pickering St, Sth Bridge Rd, Neil Rd and Cantonment Rd.
	33Bedok ↔ Kent Ridge 33AKent Ridge → Tiong Bahru Rd		TBC	33AIntroduced from Kent Ridge Ter to Tiong Bahru Rd (Blk 1) during evening peak hours on weekdays.
		2005	5 June	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
			12 June	Serves new bus stop outside Science Pk along AYE.
			26 June	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.
		2006	19 March	Amended to ply Cassia Lk, Cassia Cres, Guillemard Rd and Guillemard Camp Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction of CC8Dakota station on the Circle Line.
		2008	26 October	Serves additional bus stop opposite Kent Ridge Ter along Clementi Rd.
			29 December	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Cassia Lk, Guillemard Rd and Guillemard Camp Rd.
	33Bedok ↔ Kent Ridge 33AKent Ridge → Tiong Bahru Rd 33BBedok → Joo Chiat Rd	2009	9 August	33BIntroduced from Bedok Int to Joo Chiat Rd (Aft Tembeling Rd) during the 1st and 15th days of the lunar calendar if they fall on Sun/P.H.
		2011	19 November	Amended to Bedok Temp Int.
		2012	25 June	Designated wheelchair-accessible bus service (WAB).
		2014	30 November	Amended to Bedok Integrated Transport Hub.
	33Bedok ↔ Kent Ridge 33AKent Ridge → Tiong Bahru Rd	2016	TBC	33BDiscontinued.
	33Bedok ↔ Kent Ridge 33AKent Ridge → Tiong Bahru Rd 33BBedok → Old Airport Rd	2019	11 March	33BIntroduced from Bedok Int to Old Airport Rd (Blk 22) during morning peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.
		2024	15 September	Serves new bus stop along Alexandra Rd opposite Cycle & Carriage.

Service 33X (1985 - 1988)

Operator	Route	Year	Date	Service changes
	Bedok ↔ Kent Ridge	1985	15 September	Introduced as alternate trips between Bedok Int and Kent Ridge Ter, plying its former route via Sims Ave/Geylang Rd.
		1986	1 June	Skips removed bus stop before Ayer Rajah Rd along Clementi Rd.
		1987	6 April	Skips removed bus stop before College Rd along Outram Rd.
			27 July	Converted to peak hour service on weekdays and Saturdays.
			27 September	Amended to ply the extended Eu Tong Sen St towards Bedok Int to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St to facilitate the second stage of road expansion along New Bridge Rd.
			13 December	Serves new staggered bus stop opposite Peninsula Plaza along Nth Bridge Rd, skipping the bus stop outside St Andrew's Cath.
		1988	11 January	Serves merged bus stop along Ayer Rajah Rd.
			20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
			29 May	Amended to ply Buona Vista Flyover with the opening of the Ayer Rajah Expressway (AYE), skipping Portsdown Rd.
			24 October	Discontinued.

Service 34

1st Generation (1995 - 2002)

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	Bedok ↺ Changi Airport	1995	24 April	Introduced between Bedok Int and Changi Airport (Loop), operating on weekdays and Saturdays only.
	Bedok ↔ Changi Airport	1996	TBC	Converted to bi-directional service between Bedok Int and Changi Airport PTB 1.
		2000	TBC	Serves new pair of bus stops outside and opposite SATS Flight Kitchen along Airport Blvd.
		2002	15 September	Discontinued.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
	Punggol ↔ Changi Airport	2005	31 July	Introduced between Punggol Temp Int and Changi Airport, operating between 0545 hrs and 2345 hrs daily.
		2007	TBC	First bus from Punggol Temp Int brought forward to 0530 hrs on weekdays.
			11 November	Amended to serve Changi Airport PTB 3.
		2008	TBC	First bus from Punggol Temp Int brought forward to 0530 hrs on Saturdays, Sundays and Public Holidays.
		2009	26 October	Designated wheelchair-accessible bus service (WAB).
	34Punggol ↔ Changi Airport 34APunggol → Tampines Ave 5	2011	28 March	34AIntroduced from Punggol Temp Int to Tampines Ave 5 (Opp Tampines Stadium) during morning peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.
	34Punggol ↺ Changi Airport 34APunggol → Tampines Ave 5	2012	9 January	34Converted to loop service between Punggol Temp Int and Changi Airport PTB 2.
		2014	24 August	Serves new pair of bus stops before and after Punggol Rd along TPE.
(Current)		2016	4 September	Operations transferred to Go-Ahead Singapore.
			23 October	Serves new pair of bus stops outside UWCSEA and outside Blk 871C along Tampines Ave 5.
		2017	21 October	Serves new pair of bus stops outside Tampines East Stn along Tampines Ave 2.
			22 October	Amended to serve Changi Airport PTB 4.
	34Punggol ↺ Changi Airport 34APunggol → Tampines Ave 5 34BTampines Ave 10 ↺ Changi Airport	2019	25 March	34BIntroduced between Tampines Ave 10 and Changi Airport PTB 2 (Loop) during peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.

Service 35 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Bedok ↺ Tanah Merah Ferry Rd	1995	9 July	Introduced between Bedok Int and Tanah Merah Ferry Rd (Loop).
		1996	TBC	Serves 2 new pairs of bus stops outside and opposite Concord Express, before Tanah Merah Country Club and outside Laguna Natl Country Club along Xilin Ave.
		1997		Serves new bus stop outside Global Logistics Ctr along Xilin Ave.
		1999		Serves new pair of bus stops outside and opposite Singapore Expo along Xilin Ave.
		2002		Last bus extended to 2310 hrs daily.
		2006		Last bus extended to 2315 hrs daily.
		2011	19 November	Amended to Bedok Temp Int serve bus stop outside Bedok Stn Exit A..
		2014	23 March	Designated wheelchair-accessible bus service (WAB).
			30 November	Amended to Bedok Integrated Transport Hub.
	Bedok ↺ Alps Ave		15 December	Extended to loop at Alps Ave and converted to a day service on weekdays and Saturdays under the LTA's Bus Service Enhancement Programme (BSEP).
		2015	16 February	Serves 2 new bus stops outside Prologis and outside DHL along Alps Ave.
		2017	24 April	Amended to ply Tanah Merah Coast Rd with the partial closure of Changi Coast Rd.
		2021	26 December	Serves new pair of bus stops before and after Changi Coast Rd along Aviation Pk Rd.
		2022	24 January	Amended to ply the realigned Tanah Merah Coast Rd towards Bedok Int, serving the relocated bus stop outside Changi Naval Base.
			25 April	Amended to ply the realigned Tanah Merah Coast Rd towards Alps Ave, serving the relocated bus stop opposite Changi Naval Base.
		2023	29 May	Serves new bus stop before Aviation Pk Rd along Tanah Merah Coast Rd.

Service 35M (Current)

Operator	Route	Year	Date	Service changes
(Current)	Bedok ↺ Tanah Merah Ferry Rd	2014	15 December	Renumbered from Service 35 between Bedok Int and Tanah Merah Ferry Rd (Loop) under the LTA's Bus Service Enhancement Programme (BSEP), operating during evening off peak hours on weekdays and Saturdays and throughout the day on Sundays and Public Holidays. Wheelchair-accessible bus service (WAB) at launch.

Service 36 (Current)

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	AMBukit Merah → Changi Airport PMChangi Airport → Bukit Merah	1997	1 December	Re-numbered from Service 16E between Bt Merah Int and Changi Airport as a peak hour one-directional semi-express service on weekdays.
	Changi Airport ↺ Tomlinson Rd	1998	6 September	Amended to loop at Tomlinson Rd, amended to ply Marine Parade Rd/Siglap Link, Amber Rd, Mountbatten Rd, Marina Ctr and converted to a full day trunk service.
		2000	TBC	Serves new bus stop opposite SATS Flight Kitchen along Airport Blvd.
	36Changi Airport ↺ Tomlinson Rd 36AChangi Airport → Tomlinson Rd		TBC	36AIntroduced from Changi Airport PTB 2 to Tomlinson Rd (Opp The Regent S'pore) after the last bus of Service 36 daily.
		2002	7 July	Skips the bus stop outside Orchard Emerald along Orchard Rd.
		2003	TBC	Serves additional bus stop opposite Mandarin Gdns along Siglap Rd.
		2005	2 July	Amended to ply Grange Rd with the partial closure of Somerset Rd.
		2006	TBC	Serves additional bus stop outside Victoria Sch along Marine Parade Rd.
		2007	11 November	Amended to serve Changi Airport PTB 3.
	36Changi Airport ↺ Tomlinson Rd 36AChangi Airport → Tomlinson Rd 36BChangi Airport → Tomlinson Rd → Siglap Rd	2009	TBC	36BIntroduced from Changi Airport PTB 2 to Siglap Rd (Opp Mandarin Gdns) as a peak hour service on weekdays.
			3 December	Designated wheelchair-accessible bus service (WAB).
	36Changi Airport ↺ Tomlinson Rd 36AChangi Airport → Tomlinson Rd 36BMarine Parade Rd → Tomlinson Rd → Siglap Rd	2010	TBC	36BShortened to start from Marine Parade Rd (Lagoon View).
		2013	28 July	Serves new pair of bus stops outside One Amber and outside Tg Katong Rd Sth Playground along Tg Katong Rd South.
(Current)		2016	18 September	Operations transferred to Go-Ahead Singapore.
		2017	22 October	Amended to serve Changi Airport PTB 4.
		2018	24 July	Terminating Trip 36T was introduced for trips that terminates at Changi Airport Terminal 2, and does not go beyond Changi Airport Terminal 2.

Service 37 (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Tampines ↺ Changi North Cres	1996	15 July	Introduced between Tampines Int and Changi Nth Cres (Loop) as a peak hour service.
		1999	TBC	Last bus (AM peak) extended to 0830 hrs daily.
		2004	8 March	Last bus (AM peak) extended to 0850 hrs daily. PM peak trips adjusted to operate between 1550 hrs and 1935 hrs daily.
		2006	16 October	First bus (AM peak) brought forward to 0600 hrs on weekdays and Saturdays.
		2007	22 January	Converted to day service.
			20 October	Serves 3 new bus stops outside and opposite Edwards Lifesciences and outside Seamap along Changi Nth Cres.
		2010	5 November	First bus brought forward to 0600 hrs on Sundays and Public Holidays.
		2016	27 June	Designated wheelchair-accessible bus service (WAB).

Service 38 (Current)

Operator	Route	Year	Date	Service changes
(Current)	Tampines ↔ Bedok	2002	7 April	Introduced between Tampines Int and Bedok Int with the integration of Services 220 and 290.
			TBC	Serves new bus stop outside Blk 223 along Simei St 4.
		2011	27 June	Designated wheelchair-accessible bus service (WAB).
			19 November	Amended to Bedok Temp Int.
		2014	30 November	Amended to Bedok Integrated Transport Hub.
		2017	21 October	Serves new pair of bus stops outside Tampines East Stn along Tampines Ave 2.
		2018	8 April	Serves new pair of bus stops after Somapah Rd and before Simei Rd along Upp Changi Rd East.

Service 39 (Current)

Operator	Route	Year	Date	Service changes
(Current)	Tampines ↔ Yishun	2003	17 August	Introduced between Tampines Int and Yishun Int.
		2004	25 July	Amended to ply Jln Kayu in both directions.
			TBC	First bus from Tampines Int brought forward to 0545 hrs on weekdays.
		2006	TBC	First bus from Tampines Int brought forward to 0530 hrs on weekdays.
		2011	27 June	Designated wheelchair-accessible bus service (WAB).
		2012	29 April	Serves new bus stop outside Blk 612 along Pasir Ris Dr 1.
		2014	5 October	Serves additional pair of bus stops before and after Punggol Rd along TPE.
		2015	14 March	Amended to Yishun Temp Int.
	Tampines Concourse ↔ Yishun	2016	18 December	Extended to Tampines Concourse Int.
		2017	21 October	Serves new pair of bus stops outside Tampines East Stn along Tampines Ave 2.
		2019	8 September	Amended to Yishun Integrated Transport Hub.
		2021	24 October	Amended to ply Pasir Ris Ind Dr 1, Punggol Ctrl and Punggol Way, skipping Pasir Ris Dr 12 and a portion of TPE.
		2022	30 October	Temporarily amended to ply Pasir Ris St 11 and Pasir Ris St 12 with the partial closure of Pasir Ris Dr 1 to facilitate the construction of CR4Pasir Ris East station on the Cross Island Line.
		2023	8 October	Temporarily amended to ply Pasir Ris Ctrl and Pasir Ris Dr 8 with the partial closure of Pasir Ris Dr 1 to facilitate the construction of CR5CP1EW1Pasir Ris station on the Cross Island Line.
	39Tampines Concourse ↔ Yishun 39APasir Ris Central → Jln Kayu 39BPunggol Way → Pasir Ris Central	2024	27 May	39First bus timing from Tampines Concourse Int brought forward to 0525 hrs on weekdays.
				39AIntroduced from Pasir Ris Ctrl (Opp Pasir Ris Stn Exit B) to Jln Kayu (Aft Seletar Camp G) during peak hours on Weekdays. Wheelchair-accessible bus service (WAB) at launch.
				39BIntroduced from Punggol Way (Blk 220C) to Pasir Ris Ctrl (Pasir Ris Stn Exit B) during morning peak hours on Weekdays. Wheelchair-accessible bus service (WAB) at launch.
			24 November	Serves new pair of bus stops outside and opposite UMC along Pasir Ris Ind Dr 1.

Service 40 (Current)

Operator	Route	Year	Date	Service changes
Singapore Traction Company	Telok Kurau Rd ↔ Prince Edward	1971	11 April	Introduced between Telok Kurau Rd Ter and Prince Edward Ter under 1971 Bus Reorganisation.
United Bus Company			6 December	Operations transferred to United Bus Company.
(Current) Known as prior to 1 November 2001.	Chai Chee ↔ Prince Edward	1973	1 July	Operations transferred to Singapore Bus Services.
				Extended to Chai Chee Ter.
	Upp Changi Rd Track 6 ↔ Prince Edward	1974	1 December	Extended to Upp Changi Rd Track 6 Ter.
			8 December	Amended to ply the extended Robinson Rd, skipping Market St.
	Chai Chee ↔ Prince Edward	1975	16 November	Amended to Chai Chee Ter.
		1976	15 February	Serves new staggered bus stop outside Overseas Union Finance along Robinson Rd.
			14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
	AMChai Chee → Prince Edward PMPrince Edward → Chai Chee	1977	11 April	Converted to peak hour one-directional service from Chai Chee Ter to Prince Edward Ter during morning peak hours, and from Prince Edward Ter to Chai Chee Ter during evening peak hours on weekdays and Saturdays.
	Chai Chee ↔ Prince Edward	1978	1 June	Reverted to daily full day service with the discontinuation of Service 42.
		1979	11 February	Amended to ply the extended Shenton Way, Palmer Rd and Anson Rd, skipping Parsi Rd.
			14 October	Amended to ply Lor Sarina and Sims Ave East towards Chai Chee Ter with the conversion of Changi Rd to one-way traffic.
	Chai Chee ↺ Merpati Rd	1984	10 June	Shortened to loop at Merpati Rd from Chai Chee Ter.
	Bedok ↺ Merpati Rd	1985	8 September	Extended to Bedok Int with the closure of Chai Chee Ter.
		1992	3 May	Amended to ply Siglap Rd under TransitLink Network Integration Exercise Phase 7, skipping Telok Kurau Rd and Sims Ave East/Changi Rd.
		1998	TBC	Serves new bus stop after Geylang Rd along Aljunied Rd.
		2003		Serves new bus stop outside Shell Kiosk along Tg Katong Rd.
		2011	26 June	Serves new staggered bus stop outside Kong Hwa Sch along Circuit Rd, skipping the bus stop outside MacPherson Sec Sch.
			19 November	Amended to Bedok Temp Int.
		2013	3 December	Designated wheelchair-accessible bus service (WAB).
		2014	30 November	Amended to Bedok Integrated Transport Hub.
		2016	16 October	Serves bus stop outside MacPherson Sec Sch along Circuit Rd with the abolition of the bus stop outside Kong Hwa Sch.

Service 41

1st Generation (1971 - 1991)

Operator	Route	Year	Date	Service changes
Amalgamated Bus Company	Telok Kurau Rd ↔ Redhill	1971	11 April	Introduced between Telok Kurau Rd Ter and Redhill Cl Ter under 1971 Bus Reorganisation.
	Chai Chee ↔ Redhill	1973	1 July	Operations transferred to Singapore Bus Services.
				Extended to Chai Chee Ter.
		1974	3 February	Amended to ply Still Rd, skipping Telok Kurau Rd under 1974 Bus Rationalisation.
		1975	2 February	Amended to ply new slip road from Tiong Bahru Rd to Outram Rd with the conversion of Seng Poh Rd to one-way traffic.
			2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
		1976	18 April	Amended to ply Bedok Sth Rd, Bedok Sth Ave 1, Marine Parade Rd and Amber Rd, skipping Changi Rd, Still Rd and East Coast Rd.
			30 December	Amended to ply Paya Lebar Rd, Sims Ave and the extended Tg Katong Rd towards Chai Chee Ter.
	Bedok ↔ Redhill	1985	7 April	Amended to Bedok Int.
	Bedok ↔ Bukit Merah		15 September	Integrated with Service 44 and extended to Bt Merah Int.
		1987	6 April	Skips removed bus stop before College Rd along Outram Rd.
			27 September	Amended to ply the extended Eu Tong Sen St towards Bedok Int to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St to facilitate the second stage of road expansion along New Bridge Rd.
		1988	20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
		1990	22 July	Serves additional bus stop outside Ellenborough Mkt along Eu Tong Sen St.
		1991	7 April	Integrated with Service 197 and discontinued under TransitLink Network Integration Exercise Phase 3.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
	Jurong East ↺ Jln Anak Bt	2014	14 December	Introduced between Jurong East Temp Int and Jln Anak Bt (Loop) under LTA's Bus Service Enhancement Programme (BSEP), operating between 0545 hrs and 2345 hrs daily.
		2015	30 March	Designated wheelchair-accessible bus service (WAB).
(Current)		2016	26 June	Operations transferred to Tower Transit Singapore.
		2020	6 December	Amended to relocated Jurong East Temp Int and serve new bus stop before Jurong East Stn along Jurong Gateway Rd.

Service 41A (1971 - 1974)

Operator	Route	Year	Date	Service changes
Amalgamated Bus Company	Joo Chiat Pl ↔ Redhill	1971	11 April	Introduced between Joo Chiat Pl Ter and Redhill Cl Ter under 1971 Bus Reorganisation.
	Chai Chee ↔ Redhill	1973	1 July	Operations transferred to Singapore Bus Services.
				Extended to Chai Chee Ter.
		1974	3 February	Re-numbered Service 44 under 1974 Bus Rationalisation.

Service 42

1st Generation (1971 - 1978)

Operator	Route	Year	Date	Service changes
Singapore Traction Company	Telok Kurau Rd ↔ Intl Rd	1971	11 April	Introduced between Telok Kurau Rd Ter and Intl Rd Ter under 1971 Bus Reorganisation.
Associated Bus Services			6 December	Operations transferred to Associated Bus Services.
		1972	24 December	Extended to relocated Intl Rd Ter (near Fourth Lok Yang Rd).
	Chai Chee ↔ Intl Rd	1973	1 July	Operations transferred to Singapore Bus Services.
				Extended to Chai Chee Ter.
		1974	8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1976	15 February	Serves new staggered bus stop outside Overseas Union Finance along Robinson Rd.
			30 December	Amended to ply Paya Lebar Rd, Sims Ave and the extended Tg Katong Rd towards Chai Chee Ter.
		1978	1 June	Discontinued.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Jln Kembangan ↺ Fidelio St	1997	1 December	Re-numbered from Service M2 as a service between Jln Kembangan (Kembangan Stn) and Fidelio St (Loop).
		2014	29 September	Designated wheelchair-accessible bus service (WAB).
		2023	27 November	Last bus extended to 2400 hrs daily.

Service 43

1st Generation (1971 - 1975)

Operator	Route	Year	Date	Service changes
Singapore Traction Company	Telok Kurau Rd ↔ Prince Edward	1971	11 April	Introduced between Telok Kurau Rd Ter and Prince Edward Ter under 1971 Bus Reorganisation.
Associated Bus Services			6 December	Operations transferred to Associated Bus Services.
	Telok Kurau Rd ↔ Benoi Rd	1972	24 December	Extended to Benoi Rd Ter.
				Amended to ply Corporation Rd, Yung Ho Rd, Corporation Dr and Corporation Rd during off peak hours daily.
	Chai Chee ↔ Benoi Rd	1973	1 July	Operations transferred to Singapore Bus Services.
				Extended to Chai Chee Ter.
	Prince Edward ↺ Kallang Pk/Natl Stadium	1974	3 February	Shortened to start from Prince Edward Ter, shortened to loop at Kallang Pk and converted to peak hour service on weekdays and Saturdays only under 1974 Bus Rationalisation.
			8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1975	8 June	Discontinued.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
	Punggol ↔ Upp East Coast	2005	23 October	Introduced between Punggol Temp Int and Upp East Coast Ter, operating between 0545 hrs and 2345 hrs from Punggol Temp Int and Upp East Coast Ter daily.
		2006	TBC	Serves additional bus stop outside Victoria Sch along Marine Parade Rd.
		2009	23 August	Amended to ply the reinstated Paya Lebar Rd, skipping Eunos Ave 5 and Eunos Rd 8.
		2010	18 October	Designated wheelchair-accessible bus service (WAB).
		2011	17 December	Serves new pair of bus stops outside Soo Teck Stn along Punggol Way.
	43Punggol ↔ Upp East Coast 43ABuangkok Green → Serangoon Ctrl	2012	23 July	43AIntroduced from Buangkok Green (Blk 565) to Serangoon Ctrl (Serangoon Stn) during morning peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.
		2013	22 September	Serves new bus stop outside Wisma AUPE along Upp Paya Lebar Rd.
	Punggol ↔ Upp East Coast	2014	16 November	43ADiscontinued with the introduction of Service 43M.
			7 December	Serves new pair of bus stops before Blk 264 and outside Blk 264A along Punggol Ctrl.
		2015	30 August	Serves new pair of bus stops outside Twin Waterfalls and after TPE along Punggol Way.
(Current)		2016	4 September	Operations transferred to Go-Ahead Singapore.
				First bus from Upp East Coast Ter brought forward to 0525 hrs on weekdays.
			13 November	Serves new pair of bus stops opposite Blk 293D and outside Blk 286B along Sengkang East Rd.
		2017	26 November	Serves additional bus stop outside Punggol Stn/Int along Punggol Ctrl.

Service 43M (Current)

Operator	Route	Year	Date	Service changes
	Punggol ↺ Serangoon Ctrl	2014	16 November	Introduced between Punggol Temp Int and Serangoon Ctrl (Loop) under the LTA's Bus Service Enhancement Programme (BSEP). Wheelchair-accessible bus service (WAB) at launch.
			7 December	Serves new pair of bus stops before Blk 264 and outside Blk 264A along Punggol Ctrl.
		2015	30 August	Serves new pair of bus stops outside Twin Waterfalls and after TPE along Punggol Way.
		2016	24 January	Serves additional bus stop outside Serangoon Stadium along Boundary Rd.
(Current)			4 September	Operations transferred to Go-Ahead Singapore.
			13 November	Serves new pair of bus stops opposite Blk 293D and outside Blk 286B along Sengkang East Rd.
		2017	26 November	Serves additional bus stop outside Punggol Stn/Int along Punggol Ctrl.

Service 44

1st Generation (April - May 1971)

Operator	Route	Year	Date	Service changes
Amalgamated Bus Company	Telok Kurau Rd ↔ Delta Circus	1971	11 April	Introduced between Telok Kurau Rd Ter and Delta Circus Ter under 1971 Bus Reorganisation.
			2 May	Discontinued.

2nd Generation (1974 - 1985)

Operator	Route	Year	Date	Service changes
	Chai Chee ↔ Redhill	1974	3 February	Re-numbered from Service 41A as a service between Chai Chee Ter and Redhill Cl Ter.
		1975	2 February	Amended to ply new slip road from Tiong Bahru Rd to Outram Rd with the conversion of Seng Poh Rd to one-way traffic.
			2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
		1979	14 October	Amended to ply Still Rd and Sims Ave East towards Chai Chee Ter with the conversion of Changi Rd to one-way traffic, skipping Telok Kurau Rd.
			14 November	Amended to ply Telok Kurau Rd, skipping Still Rd.
	Chai Chee ↔ Bukit Merah	1981	15 November	Integrated with Service 63 and extended to Bt Merah Int.
		1985	15 September	Integrated with Service 33 and discontinued with the closure of Chai Chee Ter.

Service 45

1st Generation (1971 - 1984)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Kallang Pk ↺ Haig Rd	1971	11 April	Introduced between Kallang Pk Ter and Haig Rd (Loop) under 1971 Bus Reorganisation.
	Kallang Pk ↺ Kreta Ayer Rd		9 May	Extended to loop at Kreta Ayer Rd.
		1973	1 July	Operations transferred to Singapore Bus Services.
	Chai Chee ↺ Tg Rhu Rd	1974	3 February	Amended to start from Chai Chee Ter and shortened to loop at Tg Rhu Rd under 1974 Bus Rationalisation.
		1979	14 October	Amended to ply Still Rd and Sims Ave East towards Chai Chee Ter with the conversion of Changi Rd to one-way traffic.
		1984	27 May	Discontinued.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current)	Upp East Coast ↔ Ang Mo Kio Depot	2006	26 December	Introduced between Upp East Coast Ter and Ang Mo Kio Depot, operating between 0600 hrs and 2330 hrs from Upp East Coast Ter and Ang Mo Kio Depot daily.
		2010	13 February	Serves new pair of bus stops outside and opposite Blk 220 CP along Bedok Nth Ave 3.
	45Upp East Coast ↔ Ang Mo Kio Depot 45ALor Ah Soo → Upp Serangoon Rd		28 June	Designated wheelchair-accessible bus service (WAB).
				45AIntroduced from Lor Ah Soo (Opp Blk 115) to Upp Serangoon Rd (Serangoon Stn) during morning peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.
	45Upp East Coast ↔ Ang Mo Kio St 63 45ALor Ah Soo → Upp Serangoon Rd	2025	4 January	Shorten to start and terminate at bus stops outside Ang Mo Kio Depot after the closure of SBS Transit Ang Mo Kio Depot.

Service 46

1st Generation (1971 - 1975)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Tg Rhu Ter ↺ Kreta Ayer Rd	1971	11 April	Introduced between Tg Rhu Ter and Kreta Ayer Rd (Loop) under 1971 Bus Reorganisation.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1975	22 June	Discontinued.

2nd Generation (1978 - 1981)

Operator	Route	Year	Date	Service changes
	Geylang Fringe Car Pk ↺ Stadium Wk	1978	1 April	Introduced between Geylang Fringe Car Pk and Stadium Wk (Loop).
		1981	11 November	Discontinued.

3rd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current)	Upp East Coast ↔ Tampines	2016	12 June	Introduced between Upp East Coast Ter and Tampines Int under the LTA's Bus Service Enhancement Programme (BSEP), operating between 0600 hrs and 2330 hrs daily from Upp East Coast Ter and between 0600 hrs and 2345 hrs daily from Tampines Int.
		2017	21 August	Designated wheelchair-accessible bus service (WAB).
			24 December	Amended to ply Tampines Ctrl 8 and Tampines Concourse towards Tampines Int.
	Upp East Coast ↔ Pasir Ris	2022	30 October	Extended to Pasir Ris Int.

Service 47 (Current)

Operator	Route	Year	Date	Service changes
(Current)	Changi Business Pk ↺ Amber Rd	2015	20 December	Introduced between Changi Business Pk Ter and Amber Rd (Loop) under the LTA's Bus Service Enhancement Programme (BSEP), operating between 0600 hrs and 2345 hrs daily. Wheelchair-accessible bus service (WAB) at launch.

Service 48 (Current)

Operator	Route	Year	Date	Service changes
(Current)	Upp East Coast ↔ Buona Vista	2005	3 July	Introduced between Upp East Coast Ter and Buona Vista Ter, operating between 0545 hrs and 2345 hrs from Upp East Coast Ter daily, and between 0600 hrs and 2400 hrs from Buona Vista Ter daily.
			2 October	Serves new bus stop outside New 7th Storey Hotel along Rochor Rd and new bus stop near Bali Lane along Ophir Rd.
		2006	TBC	Serves additional bus stop outside Victoria Sch along Marine Parade Rd.
		2010	28 June	Designated wheelchair-accessible bus service (WAB).
		2011	4 September	Serves new bus stop outside Botanic Gdns Stn along Bt Timah Rd.
	Bedok North Depot ↔ Buona Vista		11 December	Extended to Bedok Nth Depot.
		2013	28 July	Serves new pair of bus stops outside One Amber and outside Tg Katong Rd Sth Playground along Tg Katong Rd Sth.
		2018	28 October	Skips bus stop before Winstedt Rd along Bt Timah Rd with the relocation of the bus stop outside Newton FC.
		2019	24 February	Serves reinstated bus stop before Winstedt Rd along Bt Timah Rd with the reversion in the relocation of the bus stop outside Newton FC.

Service 49 (Current)

Operator	Route	Year	Date	Service changes
	Taman Jurong ↺ Jurong West St 42	2013	14 December	Introduced between Taman Jurong Ter and Jurong West St 42 (Loop) under the LTA's Bus Service Enhancement Programme (BSEP), operating between 0600 hrs and 2330 hrs daily.
		2014	23 March	Designated wheelchair-accessible bus service (WAB).
			9 November	Amended to ply Corporation Dr, Yung Ho Rd and Yuan Ching Rd in both directions.
	Jurong East ↺ Jurong West St 42	2015	22 November	Extended to Jurong East Temp Int and amended to ply Corporation Dr and Yung Kuang Rd.
(Current)		2016	26 June	Operations transferred to Tower Transit Singapore.
		2020	6 December	Amended to relocated Jurong East Temp Int.
		2022	27 November	Serves a pair of additional bus stops before Jurong Port Rd and after Corporation Pl along Jln Ahmad Ibrahim.

Service 50

1st Generation (1971 - 1991)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Kaki Bukit ↔ Prince Edward	1971	11 April	Introduced between Kaki Bt Ter and Prince Edward Ter under 1971 Bus Reorganisation.
	Kaki Bukit ↔ Lengkok Bahru		9 May	Extended to Lengkok Bahru Ter.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	3 February	Amended to ply Sims Ave and Paya Lebar Rd under 1974 Bus Rationalisation, skipping Geylang Rd and Changi Rd.
			8 December	Amended to skip Market St.
		1975	2 February	Amended to ply new slip road from Tiong Bahru Rd to Outram Rd with the conversion of Seng Poh Rd to one-way traffic.
			2 March	Amended to ply Geylang Rd towards Lengkok Bahru Ter with the conversion of Sims Ave to one-way traffic.
		1976	15 February	Serves new staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
		1978	15 January	Amended to ply Jln Sultan, skipping Sumbawa Rd.
		1979	11 February	Amended to ply the extended Shenton Way towards Lengkok Bahru Ter, skipping Parsi Rd and Anson Rd.
	Kaki Bukit ↔ Bukit Merah		23 December	Amended to Bt Merah Ctrl Ter.
		1980	20 January	Amended to ply Spottiswoode Pk Rd with the partial conversion of Cantonment Rd to one-way traffic.
			28 September	Amended to Bt Merah Int.
		1981	11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
	Jln Eunos ↔ Bukit Merah	1984	17 June	Amended to Jln Eunos Ter.
	Eunos ↔ Bukit Merah	1987	22 March	Amended to Eunos Ter.
			6 April	Skips removed bus stop before College Rd along Outram Rd.
		1989	10 December	Amended to Eunos Int.
		1991	6 January	Discontinued under TransitLink Network Integration Exercise Phase 1.

2nd Generation (Current)

Operator	Route	Year	Date	Service changes
(Current)	Bishan ↔ Punggol	2012	16 December	Introduced between Bishan Int and Punggol Temp Int under the LTA's Bus Service Enhancement Programme (BSEP), operating between 0545 hrs and 2345 hrs on weekdays & Saturdays / between 0600 hrs and 2345 hrs on Sundays & Public Holidays from Bishan Int, and between 0530 hrs and 2345 hrs on weekdays & Saturdays / between 0545 hrs and 2345 hrs on Sundays & Public Holidays from Punggol Temp Int.
		2013	31 March	Designated wheelchair-accessible bus service (WAB).
			13 October	Amended to ply Sengkang West Ave and Sengkang West Rd with the partial closure of Jln Kayu.
		2015	11 January	Serves additional bus stop outside Blk 988B along Yio Chu Kang Rd.
		2016	25 September	Serves new pair of bus stops outside Waterwoods and after Punggol Field along Punggol East.
	50Bishan ↔ Punggol 50APunggol East → Ang Mo Kio Ave 8	2024	30 September	50AIntroduced from Punggol East (Aft Punggol Field) to Ang Mo Kio Ave 8 (Bef Ang Mo Kio Stn Exit B) during morning peak hours on weekdays excluding public holidays. Wheelchair-accessible bus service (WAB) at launch.

Service 50A (1971 - 1974)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Kaki Bt ↺ Stamford Rd	1971	11 April	Introduced between Kaki Bt Ter and Stamford Rd (Loop) under 1971 Bus Reorganisation.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	3 February	Extended to Alexandra Rd (Alexandra Hosp) Ter and re-numbered Service 53 under 1974 Bus Rationalisation.