History of Services 31 - 40

Service 31 (1974 - 1976)

Operator	Year	Date	Service changes
	1974	3 February	Re-numbered from Service 31/31A 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.

Service 31 (since 1979)

Operator	Route	Year	Date	Service changes
	Bedok ↺ Kallang Pk/Natl Stadium (1979 - 1985)	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 - 1993)	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 (since 1993)	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.
(Current)		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.
		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 Dakota MRT station on the Circle MRT 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 31/31A (1971 - 1974)

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

Short Trip 31A (since 2005)

Operator	Route	Year	Date	Service changes
(Current)	Tampines → New Upp Changi Rd (since 2005)	2005	10 January	Introduced from Tampines Int to New Upp Changi Rd (Tanah Merah Stn) during morning peak hours on weekdays.
		2015	22 June	Designated wheelchair-accessible bus service (WAB).

Service 32

Operator	Route	Year	Date	Service changes
ABC	Changi Rd ↺ Mei Chin Rd (1971 - 1973)	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.
	Chai Chee ↺ Mei Chin Rd (1973 - 1976)	1973	1 July	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 - May 1979)	1976	8 February	Amended to Mei Chin Rd Ter.
	Bedok ↔ Mei Chin Rd (May - November 1979)	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 (November 1979 - 1988)		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 (since 1988)	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.
(Current)		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 Dakota MRT station on the Circle MRT 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

Operator	Route	Year	Date	Service changes
ABC	Changi Rd ↔ Clementi Rd (April - May 1971)	1971	11 April	Introduced between Changi Rd Ter and Clementi Rd Ter under 1971 Bus Reorganisation.
	Changi Rd ↔ Pasir Panjang Rd (May 1971 - 1973)		19 May	Amended to Pasir Panjang Rd Ter.
	Chai Chee ↔ Pasir Panjang Rd (1973 - 1974)	1973	1 July	Extended to Chai Chee Ter.
	Upp Changi Rd Track 6 ↔ Pasir Panjang Rd (1974 - 1978)	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 - 1981)	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 - 1985)	1981	5 July	Amended to Kent Ridge Ter.
	Bedok ↔ Kent Ridge (since 1985)	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 Chinatown MRT station on the North East MRT Line.
		1998	TBC	First bus from Bedok Int brought forward to 0545 hrs on weekdays, and 0550 hrs on Saturdays.
(Current)		2002	20 April	Amended to ply the reinstated New Bridge Rd, skipping Upp Pickering St, Sth Bridge Rd, Neil Rd and Cantonment Rd.
		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 Dakota MRT station on the Circle MRT 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.
		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.
		2024	15 September	Serves new bus stop along Alexandra Rd opposite Cycle & Carriage.

Service 33X (1985 - 1988)

Operator	Year	Date	Service changes
	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.

Short Trip 33A

Operator	Route	Year	Date	Service changes
(Current)	Kent Ridge → Tiong Bahru Rd (since 2002)	2002	TBC	Introduced from Kent Ridge Ter to Tiong Bahru Rd (Blk 1) during evening peak hours on weekdays.
		2008	26 October	Serves additional bus stop opposite Kent Ridge Ter along Clementi Rd.
		2012	25 June	Designated wheelchair-accessible bus service (WAB).
		2024	15 September	Serves new bus stop along Alexandra Rd opposite Cycle & Carriage.

Short Trip 33B (2009 - 2016)

Operator	Year	Date	Service changes
	2009	9 August	Introduced 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.
	2016	TBC	Discontinued.

Short Trip 33B (since 2019)

Operator	Route	Year	Date	Service changes
(Current)	Bedok → Old Airport Rd (since 2019)	2019	11 March	Introduced from Bedok Int to Old Airport Rd (Blk 22) during morning peak hours on weekdays. Wheelchair-accessible at launch.

Service 34 (1995 - 2002)

Operator	Route	Year	Date	Service changes
	Bedok ↺ Changi Airport (1995 - 1996)	1995	24 April	Introduced between Bedok Int and Changi Airport (Loop), operating on weekdays and Saturdays only.
	Bedok ↔ Changi Airport (1996 - 2002)	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.

Service 34 (since 2005)

Operator	Route	Year	Date	Service changes
	Punggol ↔ Changi Airport (2005 - 2012)	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).
	Punggol ↺ Changi Airport (since 2012)	2012	9 January	Converted 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.

Short Trip 34A

Operator	Route	Year	Date	Service changes
	Punggol → Tampines Ave 5 (since 2011)	2011	28 March	Introduced from Punggol Temp Int to Tampines Ave 5 (Opp Tampines Stadium) during morning peak hours on weekdays. Wheelchair-accessible at launch.
		2014	24 August	Serves new bus stop after Punggol Rd along TPE.
(Current)		2016	4 September	Operations transferred to Go-Ahead Singapore.
			23 October	Serves new bus stop outside UWCSEA along Tampines Ave 5.

Short Trip 34B

Operator	Route	Year	Date	Service changes
(Current)	Tampines Ave 10 → Changi Airport → Tampines Ave 10 (since 2019)	2019	25 March	Introduced between Tampines Ave 10 and Changi Airport PTB 2 (Loop) during peak hours on weekdays. Wheelchair-accessible at launch.

Service 35

Operator	Route	Year	Date	Service changes
	Bedok ↺ Tanah Merah Ferry Rd (1995 - 2014)	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	TBC	Serves new bus stop outside Global Logistics Ctr along Xilin Ave.
		1999	TBC	Serves new pair of bus stops outside and opposite Singapore Expo along Xilin Ave.
(Current)		2002	TBC	Last bus extended to 2310 hrs daily.
		2006	TBC	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 (since 2014)		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

Operator	Route	Year	Date	Service changes
(Current)	Bedok ↺ Tanah Merah Ferry Rd (since 2014)	2014	15 December	Introduced 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 at launch.

Service 36

Operator	Route	Year	Date	Service changes
	Bukit Merah → Changi Airport (AM Peak) Changi Airport → Bukit Merah (PM Peak)	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 (since 1998)	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.
		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.
		2009	3 December	Designated wheelchair-accessible bus service (WAB).
		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.

Short Trip 36A

Operator	Route	Year	Date	Service changes
	Changi Airport → Tomlinson Rd (since 2000)	2000	TBC	Introduced from Changi Airport PTB 2 to Tomlinson Rd (Opp The Regent S'pore) after the last bus of Service 36 daily.
		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.
		2009	3 December	Designated wheelchair-accessible bus service (WAB).
		2013	28 July	Serves new bus stop outside One Amber along Tg Katong Rd Sth.
(Current)		2016	18 September	Operations transferred to Go-Ahead Singapore.
		2017	22 October	Amended to serve Changi Airport PTB 4.

Short Trip 36B

Operator	Route	Year	Date	Service changes
	Changi Airport → Tomlinson Rd → Siglap Rd (2009 - 2010)	2009	TBC	Introduced 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).
	Marine Parade Rd → Tomlinson Rd → Siglap Rd (since 2010)	2010	TBC	Shortened 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.

Service 37

Operator	Route	Year	Date	Service changes
	Tampines ↺ Changi North Cres (since 1996)	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.
(Current)		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

Operator	Route	Year	Date	Service changes
(Current)	Tampines ↔ Bedok (since 2002)	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

Operator	Route	Year	Date	Service changes
(Current)	Tampines ↔ Yishun (2003 - 2016)	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 (since 2016)	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 Pasir Ris East MRT station on the Cross Island MRT 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 Pasir Ris MRT station on the Cross Island MRT Line.
		2024	27 May	First bus timing from Tampines Concourse Int brought forward to 0525 hrs on weekdays.
			24 November	To serve new pair of bus stops outside and opposite UMC along Pasir Ris Ind Dr 1.

Short Trip 39A

Operator	Route	Year	Date	Service changes
(Current)	Pasir Ris Central → Jln Kayu (since 2024)	2024	27 May	Introduced from Pasir Ris Ctrl (Opp Pasir Ris Stn Exit B) to Jln Kayu (Aft Seletar Camp G) during peak hours on Weekdays. Wheelchair-accessible at launch.
			24 November	To serve new bus stop outside UMC along Pasir Ris Ind Dr 1.

Short Trip 39B

Operator	Route	Year	Date	Service changes
(Current)	Punggol Way → Pasir Ris Central (since 2024)	2024	27 May	Introduced from Punggol Way (Blk 220C) to Pasir Ris Ctrl (Pasir Ris Stn Exit B) during morning peak hours on Weekdays. Wheelchair-accessible at launch.
			24 November	To serve new bus stop opposite UMC along Pasir Ris Ind Dr 1.

Service 40

Operator	Route	Year	Date	Service changes
STC	Telok Kurau Rd ↔ Prince Edward (1971 - 1973)	1971	11 April	Introduced between Telok Kurau Rd Ter and Prince Edward Ter under 1971 Bus Reorganisation.
UBC			6 December	Operations transferred to UBC.
	Chai Chee ↔ Prince Edward (1973 - 1974)	1973	1 July	Extended to Chai Chee Ter.
	Upp Changi Rd Track 6 ↔ Prince Edward (1974 - 1975)	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 - 1977)	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.
	Chai Chee → Prince Edward (AM) Prince Edward → Chai Chee (PM)	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 - 1984)	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 - 1985)	1984	10 June	Shortened to loop at Merpati Rd from Chai Chee Ter.
	Bedok ↺ Merpati Rd (since 1985)	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.
(Current)		2003	TBC	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.