History of Services 31 - 40

Service 31 (1974 - 1977)

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.
	1977	TBC	Withdrawn.

Service 31 (since 1979)

Operator	Year	Date	Service changes
	1979	27 May	Introduced between Bedok Int and Stadium Walk (Loop).
	1980	23 July	Amended to ply Bedok South Rd, skipping Bedok South Ave 1.
	1985	7 April	Extended to Tampines Ter.
	1986	13 April	Amended to ply Stadium Rd, skipping Stadium Walk.
	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.
	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 Link 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.
Template:SBS Transit (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 Integrated Transport Hub 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 Integrated Transport Hub, 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.
		2 July	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.
	2006	19 March	Amended to ply Cassia Link, 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 Link, Guillemard Rd and Guillemard Camp Rd.
	2015	22 June	Designated wheelchair-accessible bus service (WAB).

Service 31/31A (1971 - 1974)

Operator	Year	Date	Service changes
ABS	1971	11 April	Introduced between Changi Rd Ter and Prince Edward Rd Ter under 1971 Bus Reorganisation.
		9 May	Extended to loop at Outram Park.
	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	Year	Date	Service changes
Template:SBS Transit (Current)	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	Year	Date	Service changes
ABC	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.
	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.
	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.
		2 December	Shortened to loop at Upp Cross St.
	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 North Bridge Rd, skipping the bus stop outside St Andrew's Cathedral.
	1988	23 October	Extended to Buona Vista Ter.
	1990	10 June	Amended to ply North Boat Quay, skipping South Bridge Rd, North 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.
Template:SBS Transit (Current)	2005	5 June	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
		2 July	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.
	2006	19 March	Amended to ply Cassia Link, 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 Link, 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	Year	Date	Service changes
ABC	1971	11 April	Introduced between Changi Rd Ter and Clementi Rd Ter under 1971 Bus Reorganisation.
		19 May	Amended to Pasir Panjang Rd Ter.
	1973	1 July	Extended to Chai Chee Ter.
	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.
	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.
	1981	5 July	Amended to Kent Ridge Ter.
	1985	15 September	Extended to Bedok Int with the closure of Chai Chee Ter with an alternate route introduced via Dunman Rd, Old Airport Rd and Mountbatten Rd in both directions.
	1986	1 June	Skips abolished bus stop before Ayer Rajah Rd along Clementi Rd.
	1987	6 April	Skips abolished bus stop before College Rd along Outram Rd.
		17 August	Original route via Sims Ave/Geylang Rd converted to peak hour service.
		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 North Bridge Rd, skipping the bus stop outside St Andrew's Cathedral.
	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	Original route via Sims Ave/Geylang Rd withdrawn.
	1990	22 July	Serves additional bus stop outside Ellenborough Market along Eu Tong Sen St.
	1993	11 April	Amended to ply Jln Sultan, Victoria St and Hill St, skipping South Bridge Rd and Upp Cross St.
	1994	3 July	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, North 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 an abolished 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, South 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.
Template:SBS Transit (Current)	2002	20 April	Amended to ply the reinstated New Bridge Rd, skipping Upp Pickering St, South 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 Park along AYE.
		2 July	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.
	2006	19 March	Amended to ply Cassia Link, 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 Link, 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.

Short Trip 33A

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	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).

Short Trip 33B (2009 - 2016)

Operator	Year	Date	Service changes
Template:SBS Transit	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	Withdrawn.

Short Trip 33B (since 2019)

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2019	11 March	Introduced from Bedok Integrated Transport Hub to Old Airport Rd (Blk 22) during morning peak hours on weekdays. Wheelchair-accessible at launch.

Service 34 (1995 - 2002)

Operator	Year	Date	Service changes
	1995	24 April	Introduced between Bedok Int and Changi Airport (Loop), operating on weekdays and Saturdays only.
	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.
Template:SBS Transit	2002	14 September	Withdrawn.

Service 34 (since 2005)

Operator	Year	Date	Service changes
Template:SBS Transit	2005	31 July	Introduced between Punggol Temp Int and Changi Airport.
	2007	11 November	Amended to serve Changi Airport PTB 3.
	2009	26 October	Designated wheelchair-accessible bus service (WAB).
	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.
Template:Go-Ahead Singapore (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	Year	Date	Service changes
Template:SBS Transit	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.
Template:Go-Ahead Singapore (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	Year	Date	Service changes
Template:Go-Ahead Singapore (Current)	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	Year	Date	Service changes
	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 National 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 S'pore Expo along Xilin Ave.
Template:SBS Transit (Current)	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.
		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 Road with the partial closure of Changi Coast Rd.
	2021	26 December	Serves a new pair of bus stops before and after Changi Coast Road along Aviation Park Road.

Service 35M

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2014	15 December	Introduced between Bedok Integrated Transport Hub 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	Year	Date	Service changes
	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.
	1998	6 September	Amended to loop at Tomlinson Rd, amended to ply Marine Parade Rd/Siglap Link, Amber Rd, Mountbatten Rd, Marina Centre and converted to a full day trunk service.
	2000	TBC	Serves new bus stop opposite SATS Flight Kitchen along Airport Blvd.
Template:SBS Transit	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 South Playground along Tg Katong Rd South.
Template:Go-Ahead Singapore (Current)	2016	18 September	Operations transferred to Go-Ahead Singapore.
	2017	22 October	Amended to serve Changi Airport PTB 4.

Short Trip 36A

Operator	Year	Date	Service changes
	2000	TBC	Introduced from Changi Airport PTB 2 to Tomlinson Rd (Opp The Regent S'pore) after the last bus of Service 36 daily.
Template:SBS Transit	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 South.
Template:Go-Ahead Singapore (Current)	2016	18 September	Operations transferred to Go-Ahead Singapore.
	2017	22 October	Amended to serve Changi Airport PTB 4.

Short Trip 36B

Operator	Year	Date	Service changes
Template:SBS Transit	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).
	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 South Playground along Tg Katong Rd South.
Template:Go-Ahead Singapore (Current)	2016	18 September	Operations transferred to Go-Ahead Singapore.

Service 37

Operator	Year	Date	Service changes
	1996	TBC	Introduced between Tampines Int and Changi North Cres (Loop) as a peak hour service.
Template:SBS Transit (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 North 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	Year	Date	Service changes
Template:SBS Transit (Current)	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	Year	Date	Service changes
Template:SBS Transit (Current)	2003	17 August	Introduced between Tampines Int and Yishun Int.
	2004	25 July	Amended to ply Jln Kayu in both directions.
	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.
	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 Industrial Dr 1, Punggol Central and Punggol Way, skipping Pasir Ris Dr 12 and a portion of TPE.

Service 40

Operator	Year	Date	Service changes
STC	1971	11 April	Introduced between Telok Kurau Rd Ter and Prince Edward Rd Ter under 1971 Bus Reorganisation.
UBC		6 December	Operations transferred to UBC.
	1973	1 July	Extended to Chai Chee Ter.
	1974	1 December	Extended to Upp Changi Rd Track 6 Ter.
		8 December	Amended to ply the extended Robinson Rd, skipping Market St.
	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.
	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.
	1984	10 June	Shortened to loop at 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.
Template:SBS Transit (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.