History of Services 1 - 10

Service 1 (1971 - 1989)

Operator	Year	Date	Service changes
ABS	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.
	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.
		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	Year	Date	Service changes
ABS	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.
	1974	3 February	Re-numbered Service 3 under 1974 Bus Rationalisation.

Service 2

Refer to Bus Service 2 for more information.

Service 2A (1971 - 1974)

Operator	Year	Date	Service changes
ABS	1971	1 August	Introduced between Changi Pt Ter and Commonwealth Ave Ter.
	1974	3 February	Discontinued under 1974 Bus Rationalisation.

Service 3 (1974 - 1991)

Operator	Route	Year	Date	Service changes
	Changi Point ↔ Delta (1974 - 1976)	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 (1976 - 1979)		2 August	Shortened to start from Bedok Sth Rd Ter and loop at New Bridge Rd.
	Bedok ↺ New Bridge Rd (1979 - 1987)	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 - 1991)	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.

Service 3 (since 2002)

Operator	Route	Year	Date	Service changes
	Tampines ↺ Pasir Ris St 71 (2002 - October 2003)	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.
	Tampines ↺ Punggol Stn (October - November 2003)		19 October	Extended to loop at Punggol Ctrl.
	Tampines ↔ Punggol (since November 2003)		30 November	Amended to Punggol Temp Int.
		2008	TBC	First 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)		2016	4 September	Operations transferred to Go-Ahead Singapore.
				First bus from Tampines Int brought forward to 0505 hrs on weekdays.
		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.

Short Trip 3A

Operator	Route	Year	Date	Service changes
	Tampines → Pasir Ris Dr 12 (since 2003)	2003	19 October	Introduced 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.
		2009	5 September	Serves new bus stop outside Blk 485 along Pasir Ris Dr 4.
			26 October	Designated wheelchair-accessible bus service (WAB).
		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)		2016	4 September	Operations transferred to Go-Ahead Singapore.
		2017	21 October	Serves new bus stop 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.

Short Trip 3B (2003 - 2016)

Operator	Year	Date	Service changes
	2003	19 October	Introduced from Pasir Ris Dr 1 (Blk 738) to Pasir Ris Int during evening peak hours on weekdays.
	2009	26 October	Designated wheelchair-accessible bus service (WAB).
	2012	29 April	Serves new bus stop outside Blk 612 along Pasir Ris Dr 1.
	2015	12 December	Amended to ply the extended Pasir Ris Dr 8 with the permanent closure of the west ring of Pasir Ris Ctrl.
	2016	4 September	Discontinued.

Service 4 (1971 - 1974)

Operator	Year	Date	Service changes
ABS	1971	11 April	Introduced between Changi Pt Ter and Lloyd Leas Est (Loop) under 1971 Bus Reorganisation.
	1974	3 February	Discontinued under 1974 Bus Rationalisation.

Service 4 (1979 - 1993)

Operator	Route	Year	Date	Service changes
	Bedok ↺ Lor 1 Geylang (1979 - 1980)	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 - 1988)	1980	11 February	Extended to loop at Moulmein Rd.
	Bedok ↔ St. Michael's (1988 - 1990)	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 - 1992)	1990	11 March	Integrated with Service 19 and extended to Pasir Ris Int.
	Tampines ↔ St. Michael's (1992 - 1993)	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.

Service 4 (since 2013)

Operator	Route	Year	Date	Service changes
(Current)	Tampines ↺ Changi North Way (since 2013)	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).

Service 5 (1971 - 1999)

Operator	Route	Year	Date	Service changes
ABC	Upp Changi Rd 8¼ ms ↔ Commonwealth Ave (1971 - 1973)	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 - 1974)	1973	TBC	Extended to Bt Timah Ter.
	Chai Chee ↔ Bukit Timah (1974 - 1977)	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 - 1986)	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 - 1999)	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 TIBS.
		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 Chinatown MRT station on the North East MRT Line.
			8 December	Skips the bus stop outside Kallang Stn along Sims Ave.
		1999	26 December	Discontinued under Bt Panjang LRT Rationalisation.

Service 5 (since 2007)

Operator	Route	Year	Date	Service changes
(Current)	Pasir Ris ↔ Bukit Merah (since 2007)	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 Kaki Bt MRT station on the Downtown MRT 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.
			27 August	Serves reinstated bus stop outside Newton Stn Exit B along Scotts Rd.

Short Trip 5A

Operator	Route	Year	Date	Service changes
(Current)	Mariam Way → Upp Changi Rd East (since 2023)	2023	14 August	Introduced from Mariam Way (Aft Ballota Pk) to Upp Changi Rd East (Upp Changi Stn/SUTD) during peak hours on weekdays. Wheelchair-accessible at launch.

Short Trip 5B

Operator	Route	Year	Date	Service changes
(Current)	Simei St 3 → Mariam Way (since 2023)	2023	14 August	Introduced from Simei St 3 (Simei Stn) to Mariam Way (Bef Mariam Wk) during evening peak hours on weekdays. Wheelchair-accessible at launch.

Service 6 (1977 - 1983)

Operator	Route	Year	Date	Service changes
	Chai Chee ↺ North Bridge Rd (1977 - 1979)	1977	11 July	Introduced between Chai Chee Ter and Nth Bridge Rd (Loop) as a semi-express service.
	Bedok ↺ North Bridge Rd (1979 - 1983)	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.

Service 6 (since 1993)

Operator	Route	Year	Date	Service changes
	Pasir Ris ↺ Loyang Cres (since 1993)	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 Loyang MRT station on the Cross Island MRT Line, skipping a pair of bus stops after Pasir Ris Dr 3 and before New Loyang Lk along Loyang Ave.

Service 7

Operator	Route	Year	Date	Service changes
	Bedok ↺ Holland Rd Fringe Car Pk (1979 - 1983)	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 - 1985)	1983	30 October	Integrated with Service 191 and extended to Clementi Int.
	Bedok ↔ Jurong East (1985 - 1991)	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 (since 1991)	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.
(Current)		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.

Short Trip 7A

Operator	Route	Year	Date	Service changes
(Current)	Bedok → Orchard Blvd (since 2018)	2018	25 February	Introduced from Bedok Int to Orchard Blvd (Bef Orchard Stn Exit B). Wheelchair-accessible at launch.

Short Trip 7B

Operator	Route	Year	Date	Service changes
(Current)	Clementi → Orchard Rd (since 2018)	2018	25 February	Introduced from Clementi Int to Orchard Rd (Dhoby Ghaut Stn). Wheelchair-accessible at launch.

Service 8 (1979 - 1989)

Operator	Route	Year	Date	Service changes
	Bedok ↺ Shenton Way (1979 - 1982)	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 - 1986)	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 - 1989)	1986	30 November	Extended to loop at Marina Ctr.
		1989	6 November	Discontinued.

Service 8 (since 1990)

Operator	Route	Year	Date	Service changes
	Pasir Ris ↔ Toa Payoh (1990 - 1992)	1990	1 March	Introduced between Pasir Ris Int and Toa Payoh Int.
	Tampines ↔ Toa Payoh (since 1992)	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.
(Current)		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

Refer to Bus Service 9 for more information.

Short Trip 9A

Operator	Route	Year	Date	Service changes
	Bedok → Loyang Ave (since 2001)	2001	TBC	Introduced from Bedok Int to Loyang Ave (Blk 149A) during evening peak hours on weekdays.
(Current)		2004	TBC	Serves new bus stop before Changi Fire Stn along Upp Changi Rd.
		2011	19 November	Amended to Bedok Temp Int 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 bus stop outside Tampines East Stn along Tampines Ave 2.

Short Trip 9B

Operator	Route	Year	Date	Service changes
(Current)	Simei St 3 → Airline Rd (since 2023)	2023	27 November	Introduced from Simei St 3 (Simei Stn) to Airline Rd (3rd Cargo Agents) during morning peak hours on weekdays. Wheelchair-accessible at launch.

Service 10

Operator	Route	Year	Date	Service changes
ABS	Bedok Rd ↔ Prince Edward (April - June 1971)	1971	11 April	Introduced between Bedok Rd Ter and Prince Edward Ter under 1971 Bus Reorganisation.
	Bedok Rd ↔ Shipyard Rd (June 1971 - 1974)		16 June	Extended to Shipyard Rd Ter.
		1972	24 December	Amended to ply Jln Samulun before terminating at Shipyard Rd Ter.
	Upp Changi Rd 8¼ ms ↔ Shipyard Rd (1974 - 1978)	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 - 1980)	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 - 1981)	1980	16 June	Amended to Somapah Depot.
	Somapah ↔ Jurong (1981 - 1984)	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 - 1990)	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.
			23 October	Skips a pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	Tampines ↔ Clementi (1990 - 1999)	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 (since 1999)	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.
(Current)		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 Dakota MRT station on the Circle MRT 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).