History of Services 130 - 139

Service 130

Operator	Route	Year	Date	Service changes
Singapore Traction Company	Balestier Rd ↔ Tg Pagar Rd	1971	11 April	Introduced between Balestier Rd Ter and Tg Pagar Ter under 1971 Bus Reorganisation.
United Bus Company			6 December	Operations transferred to United Bus Company.
(Current) Known as prior to 1 November 2001		1973	1 July	Operations transferred to Singapore Bus Services.
	Sin Ming Rd ↔ Tg Pagar Rd	1974	3 February	Extended to Sin Ming Rd Ter under 1974 Bus Rationalisation.
			8 December	Amended to ply Cecil St, skipping Robinson Rd.
		1979	11 February	Amended to ply the extended Shenton Way, Rambau St and Trafalgar St towards Tg Pagar Ter, skipping Parsi Rd.
	Sin Ming Rd ↔ Anson Rd		1 August	Amended to Anson Rd Ter.
			28 October	Amended to ply Ophir Rd and Blanco Court towards Anson Rd Ter with the conversion of Rochor Rd to one-way traffic.
		1983	2 January	Amended to ply Balestier Rd, Lavender St and Serangoon Rd/Jln Besar, skipping Rangoon Rd, Kitchener Rd, Kg Kapor Rd and Upp Weld Rd.
	Ang Mo Kio ↔ Anson Rd		30 October	Extended to Ang Mo Kio Int.
				Amended to ply Robinson Rd, skipping Cecil St.
				Amended to ply Victoria St and Jln Sultan, skipping Arab St and Rochor Canal Rd.
	Ang Mo Kio ↔ Prince Edward	1985	27 January	Amended to Prince Edward Ter with the closure of Anson Rd Ter.
	Ang Mo Kio ↔ Shenton Way	1987	28 June	Amended to Shenton Way Ter.
		1993	11 April	Amended to ply Victoria St, skipping Nth Bridge Rd.
		1999	TBC	Serves the bus stop opposite Bugis Junction along Victoria St, skipping the bus stop outside Bugis Stn.
		2000	TBC	Serves new bus stop after Shenton Way along Palmer Rd.
	130Ang Mo Kio ↔ Shenton Way 130AAng Mo Kio Int → Sin Ming Dr		TBC	130AIntroduced from Ang Mo Kio Int to Sin Ming Dr (Blk 25), operating during morning peak hours on weekdays and on the 27th day of every lunar month.
		2002	24 March	Amended to Ang Mo Kio Temp Int.
		2003	21 June	Amended to ply Serangoon Rd, Boon Keng Rd and Bendemeer Rd under North East Line Rationalisation Phase 1.
			TBC	Serves the bus stop outside Bugis Stn along Victoria St, skipping the bus stop opposite Bugis Junction.
		2006	TBC	130ARevised to operate during the Qing Ming period & Vesak Day only.
		2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
				Serves additional bus stop outside Victoria Concert Hall along Fullerton Rd.
		2008	2 December	Designated wheelchair-accessible bus service (WAB).
		2015	19 April	Amended to ply St. Andrew's Rd and Stamford Rd, skipping Coleman St and Hill St.
		2016	1 May	Amended to ply Esplanade Dr with the partial closure of Fullerton Rd.
		2017	25 June	Amended to the relocated Shenton Way Ter.
		2020	TBC	130ARevised to operate during the Qing Ming period only.
			8 November	Skips the bus stop opposite SLF Cplx along Thomson Rd to facilitate the construction of the North-South Corridor (NSC).
		2021	26 December	Amended to ply Esplanade Dr towards Shenton Way Ter with the closure of Connaught Dr.
	Ang Mo Kio ↔ Shenton Way	2023	1 April	130ADiscontinued. (Last day of service on 18 Apr 2021)

Service 131

Operator	Route	Year	Date	Service changes
Singapore Traction Company	Balestier Rd ↔ Tg Pagar Rd	1971	11 April	Introduced between Balestier Rd Ter and Tg Pagar Ter under 1971 Bus Reorganisation.
Associated Bus Services			6 December	Operations transferred to Associated Bus Services.
(Current) Known as prior to 1 November 2001		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	8 December	Amended to ply Cecil St, skipping Robinson Rd.
		1975	19 July	Amended to ply Coleman St and Armenian St, skipping Stamford Rd.
	Tg Pagar Rd ↺ Balestier Rd	1978	2 December	Amended to ply Balestier Rd, Jln Dusun and Jln Datoh due to the partial closure of Ah Hood Rd for redevelopment.
		1979	11 February	Amended to ply the extended Shenton Way, Rambau St and Trafalgar St towards Tg Pagar Ter, skipping Parsi Rd.
	Anson Rd ↺ Balestier Rd		1 August	Amended to Anson Rd Ter.
	Anson Rd ↺ Rangoon Rd	1983	2 January	Amended to loop at Norfolk Rd from Anson Rd Ter.
			3 July	Amended to ply Kent Rd and Owen Rd with the partial closure of Rangoon Rd to facilitate the construction of CTE.
	Prince Edward ↺ Rangoon Rd	1985	27 January	Amended to Prince Edward Ter with the closure of Anson Rd Ter.
		1987	7 June	Amended to ply Owen Rd, Dorset Rd, Kg Java Rd, Bt Timah Rd and Sungei Rd, skipping Race Course Rd, Kerbau Rd, Kg Kapor Rd, Upp Weld Rd and Jln Besar.
	Shenton Way ↺ Rangoon Rd		28 June	Amended to Shenton Way Ter.
	Shenton Way ↔ St. Michael’s	1992	3 May	Extended to St. Michael’s Ter under TransitLink Network Integration Exercise Phase 7.
	Bukit Merah ↔ St. Michael’s	1993	4 April	Extended to Bt Merah Int under TransitLink Network Integration Exercise Phase 12.
			11 April	Amended to ply Stamford Rd, skipping Coleman St and Armenian St.
		1999	TBC	Skips a pair of removed bus stops outside and opposite Wishart Rd along Telok Blangah Rd.
			TBC	Serves new bus stop outside Farrer Pk Tennis Ctr along Dorset Rd.
		2001	18 February	Serves new staggered bus stop outside Novena Stn along Thomson Rd, skipping the bus stop outside Novena Ch.
	131Bukit Merah ↔ St. Michael’s 131ASt. Michael’s → Shenton Way	2002	TBC	131AIntroduced from St. Michael’s Ter to Shenton Way (Opp Temasek Twr) during morning peak hours on weekdays.
		2005	19 June	Amended to ply Bt Purmei Ave in both directions.
	131Bukit Merah ↔ St. Michael’s 131ASt. Michael’s → Shenton Way 131BSerangoon Rd → Norfolk Rd	2006	23 January	131BIntroduced as a short-trip service from Serangoon Rd (Tekka Ctr) to Norfolk Rd (Bef Carlisle Rd) during evening peak hours on weekdays.
	131Bukit Merah ↔ St. Michael’s 131ASt. Michael’s → Shenton Way		1 June	131BDiscontinued.
			29 October	Serves new bus stop outside VivoCity along Telok Blangah Rd.
		2007	28 April	Serves additional bus stop outside Victoria Concert Hall along Fullerton Rd.
		2008	7 December	Skips removed bus stop opposite Temenggong D Mque along Telok Blangah Rd.
		2011	16 October	Amended to ply Middle Rd, Selegie Rd, Prinsep St and Bras Basah Rd with the partial closure of Bencoolen St to facilitate the construction of Bencoolen station on the Downtown Line.
			3 December	Designated wheelchair-accessible bus service (WAB).
		2014	25 August	Last bus from Bt Merah Int extended to 2400 hrs daily.
		2016	1 May	Amended to ply Esplanade Dr towards St. Michael’s Ter with the partial closure of Fullerton Rd.
			11 December	Amended to ply the reinstated Bencoolen St, skipping Middle Rd, Selegie Rd, Prinsep St and Bras Basah Rd.
		2021	26 December	Amended to ply Esplanade Dr towards Bt Merah Int with the closure of Connaught Dr.

Service 131M

Operator	Route	Year	Date	Service changes
	Bukit Merah ↺ Bukit Purmei	2014	25 August	Introduced between Bt Merah Int and Bt Purmei Ave (Loop) as a peak hour variant of Service 131 on weekdays, replacing Service 275. Wheelchair-accessible bus service (WAB) at launch.
		2022	12 December	Discontinued.

Service 132

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Ang Mo Kio Ave 6 ↺ Orchard Rd	1978	9 October	Introduced between Ang Mo Kio Ave 6 Ter and Orchard Rd (Loop).
	Ang Mo Kio ↺ Orchard Rd	1979	12 August	Amended to Ang Mo Kio Ave 3 Ter.
		1981	5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
		1983	10 April	Amended to Ang Mo Kio Int.
	Ang Mo Kio ↔ Bukit Merah	1984	29 January	Extended to Bt Merah Int.
		1986	16 November	Serves new staggered bus stop outside Thong Teck Bldg along Scotts Rd, skipping the bus stop outside Metro Orchard.
	Hougang ↔ Bukit Merah	1988	18 December	Extended to Hougang Int.
		1990	21 February	Skips removed bus stop opposite Jasmine Rd along Upp Thomson Rd.
			27 May	Serves additional bus stop outside Police Academy along Whitley Rd.
	Hougang South ↔ Bukit Merah	1994	17 December	Hougang Int renamed to Hougang Sth Int.
		2000	4 June	Serves new pair of bus stops outside and opposite British High Comm along Tanglin Rd.
	Hougang Ctrl ↔ Bukit Merah	2004	15 February	Amended to Hougang Ctrl Int with the closure of Hougang Sth Int.
		2013	31 March	Designated wheelchair-accessible bus service (WAB).
		2020	8 November	Skips the bus stop opposite SLF Cplx along Thomson Rd to facilitate the construction of the North-South Corridor (NSC).
		2023	23 July	Amended to ply temporary slip road and Mt Pleasant Rd towards Hougang Ctrl Int with the temporary closure of slip road to PIE Exit 17D, serving new staggered bus stop after Mt Pleasant Rd along Thomson Rd.

Service 132A

Operator	Route	Year	Date	Service changes
	Ang Mo Kio ↺ Tomlinson Rd	1984	30 January	Introduced between Ang Mo Kio Int and Tomlinson Rd (Loop) as a peak hour service on weekdays & Saturdays.
		1986	14 April	Discontinued.

Service 133

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Ang Mo Kio Ave 6 ↺ North Bridge Rd	1978	29 December	Introduced between Ang Mo Kio Ave 6 Ter and Nth Bridge Rd (Loop).
	Ang Mo Kio ↺ North Bridge Rd	1980	6 January	Amended to Ang Mo Kio Ave 3 Ter.
		1981	5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
		1983	6 February	Amended to ply CTE towards Ang Mo Kio Ctrl 2 Ter with the closure of temporary slip road between Braddell Rd and Lor Chuan.
			10 April	Amended to Ang Mo Kio Int.
			20 June	Amended to ply CTE towards Nth Bridge Rd.
	Ang Mo Kio ↔ Marina Ctr	1987	26 July	Extended to Marina Ctr Ter.
		1989	5 November	Amended to ply Ang Mo Kio Ave 1, Boundary Rd, Serangoon Ave 2 and Upp Serangoon Rd, skipping CTE.
	Ang Mo Kio ↺ Temasek Ave	1997	23 March	Amended to loop at Temasek Ave and amended to ply Kallang Rd and Victoria St, skipping Crawford St and Nth Bridge Rd.
		2000	TBC	Last bus extended to 2345 hrs on Saturdays.
	133Ang Mo Kio ↺ Temasek Ave 133AAng Mo Kio → Raffles Ave		TBC	133AIntroduced from Ang Mo Kio Int to Raffles Ave (Opp Marina Sq) during morning peak hours on weekdays.
		2002	24 March	Amended to Ang Mo Kio Temp Int.
			TBC	Serves new pair of bus stops after Sommerville Rd and after Sunshine Lodge along Upp Serangoon Rd.
		2003	TBC	Serves new pair of bus stops outside Potong Pasir Stn along Upp Serangoon Rd.
		2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
	Ang Mo Kio ↔ Shenton Way	2010	26 April	Extended to Shenton Way Ter.
				133ADiscontinued with the route extension of Service 133 to Shenton Way Ter.
		2011	30 May	Last bus from Shenton Way Ter extended to 2400 hrs daily.
			26 September	Designated wheelchair-accessible bus service (WAB).
		2012	14 January	Serves relocated bus stop after Marina St along Marina Stn Rd.
		2013	29 December	Amended to ply Central Blvd and Shenton Way with the opening of MCE.
		2014	28 September	Amended to ply Robinson Rd and Marina Blvd towards Ang Mo Kio Int, skipping Maxwell Rd and Central Blvd with the road changes in Marina Sth area.
		2017	25 June	Amended to the relocated Shenton Way Ter.

Service 133A

Operator	Route	Year	Date	Service changes
	Ang Mo Kio ↔ Marina Ctr	1988	10 July	Introduced between Ang Mo Kio Int and Marina Ctr Ter as an alternate route of Service 133 via Boundary Rd and Serangoon Ave 2.
		1989	5 November	Integrated with Service 133 and discontinued.

Service 133M

Operator	Route	Year	Date	Service changes
	Shenton Way ↺ Temasek Ave	2010	26 April	Introduced between Shenton Way Ter and Temasek Ave (Loop).
			4 October	Revised to operate on Saturdays, Sundays and Public Holidays only.
		2011	26 September	Designated wheelchair-accessible bus service (WAB).
		2012	26 May	Discontinued.

Service 134

1^st Generation (1980 – 1993)

Operator	Route	Year	Date	Service changes
	Ang Mo Kio ↔ New Bridge Rd	1980	17 August	Introduced between Ang Mo Kio Ave 3 Ter and New Bridge Rd Ter.
		1981	5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
		1983	10 April	Amended to Ang Mo Kio Int.
		1987	6 June	Amended to the relocated New Bridge Rd Ter.
			27 September	Amended to ply the extended Eu Tong Sen St towards Ang Mo Kio Int to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Ang Mo Kio 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.
	Bishan ↔ New Bridge Rd	1992	3 May	Shortened to Bishan Int under TransitLink Network Integration Exercise Phase 7.
		1993	11 April	Amended to ply Hill St and New Bridge Rd, skipping Nth Bridge Rd, Sth Bridge Rd and Upp Cross St.
			5 December	Integrated with Service 104 to form Service 54 and discontinued under TransitLink Network Integration Exercise Phase 14.

2^nd Generation (since 2016)

Operator	Route	Year	Date	Service changes
(Current)	Sims Pl ↺ Marine Terr	2016	20 March	Introduced between Sims Pl Ter and Marine Terr (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 135

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Toa Payoh ↔ Bedok Rd	1974	3 February	Re-numbered from Service 155A between Toa Payoh Town Ctr Ter and Bedok Rd Ter under 1974 Bus Rationalisation.
	Toa Payoh ↔ Upp Changi Rd 8¼ ms		10 November	Amended to Upp Changi Rd 8¼ ms (13.3 km) Ter.
		1975	2 March	Amended to ply Sims Ave towards Bedok Rd Ter with the conversion of Geylang Rd to one-way traffic.
		1976	18 July	Amended to skip Tanah Merah Besar Rd and Nicoll Dr on Sundays and Public Holidays.
			30 December	Amended to ply Sims Ave/Geylang Rd and the extended Tg Katong Rd, skipping Guillemard Rd.
		1979	TBC	Relocated to Upp Changi Rd 15.5km Ter.
	Toa Payoh ↔ Somapah Depot	1980	16 June	Amended to Somapah Depot.
			28 December	Amended to ply Upp Changi Rd East, skipping Upp Changi Rd.
	Toa Payoh ↔ Marine Parade	1981	21 June	Shortened to Marine Parade Ter.
	Marine Parade ↺ Circuit Rd	1983	26 December	Shortened to loop at Circuit Rd from Marine Parade Ter and amended to ply Marine Parade Rd, skipping East Coast Rd.
	Marine Parade ↔ Ang Mo Kio	1987	19 April	Extended to Ang Mo Kio Int.
		1994	TBC	First bus from Marine Parade Ter brought forward to 0545 hrs on weekdays and Saturdays.
	135Ang Mo Kio ↺ Siglap Rd 135AAng Mo Kio → Siglap Rd	2001	16 September	Amended to loop at Siglap Rd from Ang Mo Kio Int with the closure of Marine Parade Ter.
				135AIntroduced from Ang Mo Kio Int to Siglap Rd (Opp Mandarin Gdns), operating after the last bus of Service 135 daily.
		2002	24 March	Amended to Ang Mo Kio Temp Int.
			TBC	Serves new pair of bus stops after Sommerville Rd and after Sunshine Lodge along Upp Serangoon Rd.
		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 Paya Lebar station on the Circle Line.
			TBC	Serves new bus stop outside Victoria Sch along Marine Parade Rd.
			TBC	Serves new bus stop outside Shell Kiosk along Tg Katong Rd.
	135Ang Mo Kio ↺ Siglap Rd 135AAng Mo Kio → Marine Parade Rd	2005	25 April	135AExtended to terminate at Marine Parade Rd (Victoria Sch).
		2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
		2009	23 August	Amended to ply the reinstated Paya Lebar Rd, skipping Eunos Ave 5 and Eunos Rd 8.
			22 November	Serves new bus stop opposite MacPherson Stn along Circuit Lk.
		2011	7 March	Designated wheelchair-accessible bus service (WAB).
			26 June	Amended to ply Lor Bengkok with the closure of Circuit Lk to facilitate the construction of MacPherson station on the Downtown Line.
		2016	16 October	Amended to ply the reinstated Circuit Lk, skipping Lor Bengkok.
		2017	12 March	Amended to ply Upp Serangoon Rd and the diverted Upp Aljunied Rd.
		2018	23 September	Amended to ply ECP and Bedok Sth Ave 1 with the partial closure of Siglap Lk to facilitate the construction of Siglap station on the Thomson-East Coast Line.
		2020	22 March	Amended to ply the reinstated Siglap Lk, skipping ECP and Bedok Sth Ave 1.
	Ang Mo Kio ↔ Jln Kembangan	2021	28 February	Amended to terminate at Jln Kembangan (Kembangan Stn) via Telok Kurau Rd, East Coast Rd and Frankel Ave and converted to bi-directional service, skipping Siglap Rd and a portion of Marine Parade Rd.
				135ADiscontinued with the amendment of Service 135 to Jln Kembangan (Kembangan Stn).
		2025	13 April	Amended to ply Haig Rd and Dunman Rd, skipping a section of Tg Katong Rd.
			8 June	Serves a new pair of bus stops along Haig Rd.

Service 136

1^st Generation (1974 – 1975)

Operator	Route	Year	Date	Service changes
	Toa Payoh ↺ Stamford Rd	1974	3 February	Re-numbered from Service 140A as a service between Toa Payoh Town Ctr Ter and Stamford Rd (Loop).
	Toa Payoh ↔ Prince Edward		TBC	Extended to Prince Edward Ter.
		1975	TBC	Discontinued.

2^nd Generation (since 1978)

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	Ang Mo Kio Ave 6 ↔ Upp Serangoon Rd (10.5 km)	1978	27 July	Introduced between Ang Mo Kio Ave 6 Ter and Upp Serangoon Rd 10.5 km Ter.
	Ang Mo Kio Ave 6 ↺ Upp Serangoon Rd		4 December	Extended to loop at Upp Serangoon Rd.
	Ang Mo Kio ↺ Upp Serangoon Rd	1980	6 January	Amended to Ang Mo Kio Ave 3 Ter.
		1981	5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
		1983	10 April	Amended to Ang Mo Kio Int.
		1994	TBC	Last bus extended to 2345 hrs on Saturdays.
	Ang Mo Kio ↔ Hougang Ctrl		18 December	Amended to Hougang Ctrl Int.
	Ang Mo Kio ↺ Hougang Ave 8	1996	22 June	Amended to loop at Hougang Ave 8 from Ang Mo Kio Int.
	Ang Mo Kio ↺ Upp Serangoon Rd	2001	1 January	Amended to loop at Upp Serangoon Rd.
			15 July	Amended to u-turn around Boundary Rd before proceeding to Yio Chu Kang Rd towards Ang Mo Kio Int, serving an additional bus stop outside S'pore Crocodilarium along Upp Serangoon Rd.
	136Ang Mo Kio ↺ Punggol Ctrl 136AAng Mo Kio → Punggol Ctrl	2002	17 February	Extended to loop at Punggol Ctrl from Ang Mo Kio Int.
				136AIntroduced from Ang Mo Kio Int to Punggol Ctrl (Opp Blk 293), operating after the last bus of Service 136 daily.
			24 March	Amended to Ang Mo Kio Temp Int.
	136Ang Mo Kio ↺ Punggol Stn 136AAng Mo Kio → Punggol Stn	2003	14 September	Amended to loop at Punggol Ctrl.
				136AAmended to terminate at Punggol Ctrl (Punggol Stn).
	Ang Mo Kio ↔ Punggol		30 November	Amended to Punggol Int.
				136ADiscontinued with the route amendment of Service 136 to Punggol Int.
		2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
		2011	7 March	Designated wheelchair-accessible bus service (WAB).
(Current)		2016	4 September	Operations transferred to Go-Ahead Singapore.

Service 137

Operator	Route	Year	Date	Service changes
(Current)	Sims Pl ↔ Upp East Coast	2017	21 October	Introduced between Sims Pl Ter and Upp East Coast Ter under the LTA's Bus Service Enhancement Programme (BSEP), operating between 0600 hrs and 2330 hrs daily from Sims Pl Ter and Upp East Coast Ter. Wheelchair-accessible bus service (WAB) at launch.
	137Sims Pl ↔ Upp East Coast 137ANew Upp Changi Rd → Bedok North Rd	2019	11 February	137AIntroduced from New Upp Changi Rd (Bedok Stn Exit B) to Bedok Nth Rd (Bedok Nth Stn Exit A) during morning peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.
		2025	31 August	Skips bus stop outside Kew Green Condo along Upp East Coast Rd.

Service 138

1^st Generation (1972 – 1974)

Operator	Route	Year	Date	Service changes
United Bus Company	Toa Payoh ↺ Jln Aman	1972	26 June	Introduced between Toa Payoh Town Ctr Ter and Jln Aman (Loop).
		1974	3 February	Discontinued under 1974 Bus Rationalisation.

2^nd Generation (1978 – 1988)

Operator	Route	Year	Date	Service changes
	Ang Mo Kio Ave 6 ↺ Robinson Rd	1978	27 July	Introduced between Ang Mo Kio Ave 6 Ter and Robinson Rd (Loop), replacing Blue Arrow Service 308.
			3 December	Amended to ply Mayne Rd and Bt Timah Rd with the partial conversion of Mackenzie Rd to two-way traffic.
		1979	11 February	Amended to ply the extended Shenton Way, Keppel Rd and Anson Rd, skipping Parsi Rd.
	Ang Mo Kio ↺ Robinson Rd		12 August	Amended to Ang Mo Kio Ave 3 Ter.
			15 October	Amended to ply Marymount Rd, converted to a semi-express service operating on weekdays and Saturdays only.
			28 October	Amended to ply Sungei Rd (towards Shenton Way) and Bt Timah Rd (towards Ang Mo Kio Ave 3 Ter) with the partial conversion of Bt Timah Rd to two-way traffic and Rochor Canal Rd to one-way traffic, skipping Mackenzie Rd and Mayne Rd.
		1981	5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
			11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
	Ang Mo Kio ↺ Shenton Way		2 November	Converted to express service, calling at key bus stops along Ang Mo Kio Ave 3, Ang Mo Kio Ave 6, Anson Rd, Robinson Rd, Collyer Quay, Connaught Dr and Coleman St.
		1982	TBC	Last bus extended to 1930 hrs on weekdays & Saturdays.
		1983	10 April	Amended to Ang Mo Kio Int.
		1985	15 April	Serves all bus stops along Connaught Dr, Collyer Quay, Raffles Quay and Shenton Way and amended to ply Dhoby Ghaut, Selegie Rd, Bt Timah Rd and Kg Java Rd towards Ang Mo Kio Int.
		1986	7 January	Serves all bus stops along Marymount Rd.
		1988	24 January	Discontinued.

3^rd Generation (since 1994)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Yio Chu Kang ↺ Mandai Lake Rd	1994	26 April	Introduced between Yio Chu Kang Ter and Mandai Lake Rd (Loop).
	Ang Mo Kio ↺ Mandai Lake Rd		1 October	Amended to Ang Mo Kio Int.
		1996	TBC	Serves new bus stop outside Jubilee along Ang Mo Kio Ave 8.
		1997	TBC	Serves new bus stop before Mandai Rd along Mandai Lake Rd.
		2002	24 March	Amended to Ang Mo Kio Temp Int and amended to ply Ang Mo Kio Ave 3 and Ang Mo Kio Ave 6.
	Ang Mo Kio ↺ Mandai Lake Rd	2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
	138Ang Mo Kio ↺ Mandai Lake Rd 138AAng Mo Kio Int → Ang Mo Kio Ave 5	2009	22 June	138AIntroduced from Ang Mo Kio Int to Ang Mo Kio Ave 5 (Opp Blk 604) during evening peak hours on weekdays.
	Ang Mo Kio ↺ Mandai Lake Rd		12 October	138ADiscontinued.
		2011	26 September	Designated wheelchair-accessible bus service (WAB).
	138Ang Mo Kio ↺ Mandai Lake Rd 138AAng Mo Kio → Mandai Lake Rd	2012	1 December	138AIntroduced from Ang Mo Kio Int to Mandai Lake Rd (Singapore Zoo) on Saturdays, Sundays and Public Holidays. Wheelchair-accessible bus service (WAB) at launch.
	138Ang Mo Kio ↺ Mandai Lake Rd 138AAng Mo Kio → Mandai Lake Rd 138BAng Mo Kio → Ang Mo Kio Ave 5	2015	19 October	138BIntroduced from Ang Mo Kio Int to Ang Mo Kio Ave 5 (Opp Blk 604) during evening peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.
		2018	14 October	Skips a pair of removed bus stops before and after Singapore Zoo along Mandai Lake Rd.
		2024	14 October	138AEnhanced to operate from Upp Thomson Rd (Springleaf Stn Exit 3) to Mandai Lake Rd (Singapore Zoo) during weekday morning peak hours.
	138Ang Mo Kio ↺ Mandai Lake Rd 138AAng Mo Kio → Mandai Lake Rd 138BAng Mo Kio → Ang Mo Kio Ave 5 138CMandai Lake Rd → Upp Thomson Rd		8 December	138CIntroduced from Mandai Lake Rd (Singapore Zoo) to Upper Thomson Rd (Springleaf Stn Exit 2) on weekends and public holidays, operating from 1445 hrs to 1900 hrs. Wheelchair-accessible bus service (WAB) at launch.
	138Ang Mo Kio ↺ Mandai Lake Rd 138AUpp Thomson Rd → Mandai Lake Rd 138CMandai Lake Rd → Upp Thomson Rd	2025	15 March	138AShortened to start from Upp Thomson Rd (Springleaf Stn Exit 3), operating in the mornings and weekend afternoons.
				138BDiscontinued.

Service 138M

Operator	Route	Year	Date	Service changes
(Current)	Ang Mo Kio ↺ Ang Mo Kio Ave 6	2025	15 March	Introduced as a supplementary service between Ang Mo Kio Int and Ang Mo Kio Ave 6 (Loop) on Weekdays and Saturdays. Wheelchair-accessible bus service (WAB) at launch.

Service 139

Operator	Route	Year	Date	Service changes
United Bus Company	Toa Payoh ↔ Lengkok Bahru	1971	21 September	Introduced between Toa Payoh Town Ctr Ter and Lengkok Bahru Ter.
			28 September	Amended to ply the extended Ganges Ave towards Toa Payoh Town Ctr Ter.
(Current) Known as prior to 1 November 2001		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	1 October	Serves merged bus stop outside Sri Srinivasa Perumal Tp along Serangoon Rd.
		1979	11 November	Amended to ply Ganges Ave towards Lengkok Bahru Ter with the realignment of Delta Circus.
	Toa Payoh ↔ Bukit Merah		23 December	Amended to Bt Merah Ctrl Ter.
		1980	20 January	Amended to ply the branch road of Havelock Rd towards Bt Merah Ctrl Ter.
			28 September	Amended to Bt Merah Int.
		1983	26 December	Amended to Toa Payoh Int.
		1986	2 February	Amended to ply Orchard Rd and Penang Rd towards Bt Merah Int, skipping Fort Canning Rd.
		1991	21 April	Amended to ply Bt Merah Ctrl.
		1992	TBC	Amended to ply Clemenceau Ave towards Toa Payoh Int, skipping Tank Rd.
		1993	4 April	Integrated with Service 122 and amended to ply River Valley Rd, Delta Rd and Alexandra Rd under TransitLink Network Integration Exercise Phase 12, skipping Havelock Rd, Ganges Ave, Lower Delta Rd and Tiong Bahru Rd.
		1997	29 December	Amended to ply Ah Hood Rd, Jln Rajah, Whampoa Rd, Jln Bahagia and Kim Keat Rd/Whampoa Dr.
		1998	31 May	Amended to Toa Payoh Temp Int.
		1999	TBC	Skips removed bus stops outside Rajah Maisonette along Jln Rajah and outside Tai Gin Apts and outside Moulmein CC along Ah Hood Rd.
			TBC	First bus from Toa Payoh Temp Int brought forward to 0530 hrs on weekdays.
		2000	TBC	Serves additional bus stop outside Blk 4 along Delta Rd.
		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
		2003	21 June	Amended to ply Serangoon Rd, Boon Keng Rd and Bendemeer Rd under North East MRT Line Rationalisation Phase 1.
		2007	16 January	Skips relocated bus stop outside Dhoby Ghaut Stn along Penang Rd.
		2011	16 October	Amended to ply Middle Rd, Selegie Rd, Prinsep St and Bras Basah Rd with the partial closure of Bencoolen St to facilitate the construction of Bencoolen station on the Downtown Line.
	139Toa Payoh ↔ Bukit Merah 139AToa Payoh → Kim Keat Rd	2012	27 August	139AIntroduced from Toa Payoh Int to Kim Keat Rd (Opp Jumbo Ind Bldg) during evening peak hours on weekdays.
		2013	3 December	Designated wheelchair-accessible bus service (WAB).
	Toa Payoh ↔ Bukit Merah	2014	14 September	139ADiscontinued with the introduction of Service 139M.
		2016	11 December	Amended to ply the reinstated Bencoolen St, skipping Middle Rd, Selegie Rd, Prinsep St and Bras Basah Rd.
		2018	28 October	Amended to ply McNair Rd and Towner Rd, skipping Serangoon Rd.
	139Toa Payoh ↔ Bukit Merah 139AToa Payoh → Jln Bahagia	2022	12 December	139AIntroduced from Toa Payoh Int to Jln Bahagia (Bet Blks 33/34) during evening peak hours on weekdays, replacing Service 139M.

Service 139M

Operator	Route	Year	Date	Service changes
	Toa Payoh ↺ Jln Bahagia	2014	14 September	Introduced between Toa Payoh Int and Jln Bahagia (Loop) under the LTA's Bus Service Enhancement Programme (BSEP). Wheelchair-accessible bus service (WAB) at launch.
		2022	11 December	Discontinued with the introduction of Short-Trip 139A.

See also

• History of Bus Services