History of Services 150 - 159

Service 150

1^st Generation (1971 - 1990)

Operator	Route	Year	Date	Service changes
United Bus Company	Lor 1 Toa Payoh ↔ Crawford St	1971	11 April	Introduced between Lor 1 Toa Payoh Ter and Crawford St Ter under 1971 Bus Reorganisation.
	Toa Payoh ↔ Crawford St		2 August	Amended to Toa Payoh Town Ctr Ter.
		1978	5 March	Amended to ply Keng Lee Rd with the partial conversion of Kg Java Rd to one-way traffic.
			3 December	Amended to ply Mayne Rd and Bt Timah Rd with the partial conversion of Mackenzie Rd to two-way traffic.
		1979	28 October	Amended to ply Sungei Rd (towards Crawford St Ter) and Weld Rd, Jln Besar and Bt Timah Rd (towards Toa Payoh Town Ctr 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.
		1980	3 February	Integrated with Service 149 and amended to ply Jln Sultan, Beach Rd, Middle Rd and Selegie Rd towards Toa Payoh Town Ctr Ter, skipping Arab St, Rochor Canal Rd, Weld Rd, Jln Besar and Rochor Canal Rd.
		1983	26 December	Amended to Toa Payoh Int.
		1990	2 September	Integrated with Service 56 and discontinued.

2^nd Generation (since 2016)

Operator	Route	Year	Date	Service changes
(Current)	Eunos ↺ Marine Terrace	2016	20 March	Introduced between Eunos Int and Marine Terr (Loop) under the LTA's Bus Service Enhancement Programme (BSEP), operating between 0600 hrs and 2330 hrs daily. Wheelchair-accessible bus service (WAB) at launch.

Service 151

1^st Generation (1971 - 1989)

Operator	Route	Year	Date	Service changes
United Bus Company	Kim Keat Ave ↔ South Canal	1971	11 April	Introduced between Kim Keat Ave Ter and Sth Canal Ter under 1971 Bus Reorganisation.
	Toa Payoh ↔ South Canal		2 August	Amended to Toa Payoh Town Ctr Ter.
		1972	11 June	Amended to ply Upp Cross St with the partial conversion of Havelock Rd to one-way traffic, skipping Upp Hokien St.
		1973	1 July	Operations transferred to Singapore Bus Services.
	Toa Payoh ↔ Outram Pk	1974	3 February	Integrated with Service 159 and extended to Outram Pk Ter under 1974 Bus Rationalisation.
		1975	2 February	Amended to ply Tiong Bahru Rd and the extended Zion Rd towards Toa Payoh Town Ctr Ter with the partial conversion of Kim Seng Rd and Outram Rd to one-way traffic.
	Toa Payoh ↺ New Bridge Rd	1976	1 January	Extended to loop at New Bridge Rd from Toa Payoh Town Ctr Ter.
		1983	26 December	Amended to Toa Payoh Int and converted to day service on weekdays & Saturdays.
		1986	16 November	Serves new staggered bus stop outside Thong Teck Bldg along Scotts Rd, skipping the bus stop outside Metro Orchard.
		1987	6 April	Skips removed bus stop before College Rd along Outram Rd.
			1 November	Amended to ply Eu Tong Sen St towards Toa Payoh Int to facilitate the second stage of road expansion along New Bridge Rd.
		1989	28 May	Discontinued.

2^nd Generation (since 1993)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Hougang ↔ Kent Ridge	1993	4 April	Introduced between Hougang Int and Kent Ridge Ter under TransitLink Network Integration Exercise Phase 12.
		1994	23 January	Amended to ply Hougang Ave 3, skipping Defu Ave 1.
			TBC	First bus from Hougang Int revised to 0600 hrs on weekdays and Saturdays. Last bus from Hougang Int revised to 2300 hrs daily.
			TBC	First bus from Kent Ridge Ter revised to 0630 hrs daily. Last bus from Kent Ridge Ter revised to 2300 hrs on weekdays and Saturdays.
			11 September	Amended to ply Kent Ridge Cres.
	Hougang South ↔ Kent Ridge		17 December	Hougang Int renamed to Hougang Sth Int.
		1996	TBC	Last bus from Kent Ridge Ter brought forward to 2300 hrs on Sundays and Public Holidays.
		1999	TBC	First bus from Kent Ridge Ter brought forward to 0615 hrs on weekdays.
	151Hougang South ↔ Kent Ridge 151AKent Ridge → Dunearn Rd	2000	TBC	151AIntroduced from Kent Ridge Ter to Dunearn Rd (Aft Kheam Hock Rd) during evening peak hours on weekdays.
	151Hougang Ctrl ↔ Kent Ridge 151AKent Ridge → Dunearn Rd	2004	15 February	151Extended to Hougang Ctrl Int with the closure of Hougang Sth Int.
		2007	TBC	Skips removed bus stop before Paya Lebar Rd along Airport Rd to facilitate the construction of KPE.
		2010	2 December	Designated wheelchair-accessible bus service (WAB).
		2011	4 September	Amended to skip Bendemeer Rd, Whampoa Nth and Serangoon Rd towards Kent Ridge Ter with the permanent closure of Whampoa Nth.
				Serves new bus stop outside Botanic Gdns Stn along Bt Timah Rd.
	Hougang Ctrl ↔ Kent Ridge	2012	23 July	151ADiscontinued.

Service 152

Operator	Route	Year	Date	Service changes
Associated Bus Services	Lor 1 Toa Payoh ↔ Telok Kurau Rd	1971	11 April	Introduced between Lor 1 Toa Payoh Ter and Telok Kurau Rd Ter under 1971 Bus Reorganisation.
	Toa Payoh ↔ Telok Kurau Rd		2 August	Amended to Toa Payoh Town Ctr Ter.
	Toa Payoh ↔ Chai Chee	1973	1 July	Operations transferred to Singapore Bus Services.
				Extended to Chai Chee Ter.
		1976	30 December	Amended to ply Sims Ave/Geylang Rd and the extended Tg Katong Rd, skipping Guillemard Rd.
	Toa Payoh ↔ Bedok South Rd	1977	15 August	Extended to Bedok Sth Rd Ter and amended to ply Sims Ave/Geylang Rd and Changi Rd, skipping Tg Katong Rd, Mountbatten Rd, East Coast Rd and Telok Kurau Rd.
	Toa Payoh ↔ Bedok	1979	8 April	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	26 December	Amended to Toa Payoh Int.
		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.
		2000	29 October	Integrated with Service 28 and discontinued.

Service 153

Operator	Route	Year	Date	Service changes
United Bus Company	Lor 1 Toa Payoh ↔ Henderson Rd	1971	11 April	Introduced between Lor 1 Toa Payoh Ter and Jln Bt Merah Ter under 1971 Bus Reorganisation.
	Toa Payoh ↔ Henderson Rd		2 August	Amended to Toa Payoh Town Ctr Ter.
(Current) Known as prior to 1 November 2001		1973	1 July	Operations transferred to Singapore Bus Services.
	Toa Payoh ↔ Bukit Merah	1979	23 December	Amended to Bt Merah Ctrl Ter.
		1980	28 September	Amended to Bt Merah Int.
	Upp Serangoon ↔ Bukit Merah	1983	26 December	Integrated with Service 156 and extended to Upp Serangoon Ter.
		1992	29 March	Amended to ply Bt Merah Ctrl.
	Bukit Merah ↔ Hougang Ctrl	1994	18 December	Amended to Hougang Ctrl Int.
		1998	24 May	Amended to Hougang Ctrl Temp Int.
		2001	20 May	Amended back to Hougang Ctrl Int.
		2002	TBC	Serves new pair of bus stops after Sommerville Rd and after Sunshine Lodge along Upp Serangoon Rd.
	153Bukit Merah ↔ Hougang Ctrl 153AHougang Ctrl Int → Lor 2 Toa Payoh		TBC	153AIntroduced from Hougang Ctrl Int to Lor 2 Toa Payoh (Toa Payoh Stn) during morning peak hours on weekdays.
		2004	TBC	Skips removed bus stop outside Nanyang Pr Sch along Farrer Rd.
	Bukit Merah ↔ Hougang Ctrl	2006	TBC	153ADiscontinued.
		2011	4 September	Serves new bus stop outside Botanic Gdns Stn along Bt Timah Rd.
		2015	28 September	Designated wheelchair-accessible bus service (WAB).

Service 153A

Operator	Route	Year	Date	Service changes
United Bus Company	Lor 1 Toa Payoh ↔ Henderson Rd	1971	19 July	Introduced between Lor 1 Toa Payoh Ter and Jln Bt Merah Ter.
	Toa Payoh ↔ Henderson Rd		2 August	Amended to Toa Payoh Town Ctr Ter.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	3 February	Integrated with Service 95 and discontinued under 1974 Bus Rationalisation.

Service 154

Operator	Route	Year	Date	Service changes
United Bus Company	MacPherson ↔ Intl Rd	1971	11 April	Introduced between MacPherson Ter and Intl Rd Ter under 1971 Bus Reorganisation.
(Current) Known as prior to 1 November 2001		1973	1 July	Operations transferred to Singapore Bus Services.
	MacPherson ↔ Jurong	1978	1 June	Amended to Jurong Int and amended to ply MacPherson Rd, Serangoon Rd and Jln Toa Payoh, skipping Upp Aljunied Rd, Upp Serangoon Rd, Braddell Rd, Lor 5 Toa Payoh, Lor 4 Toa Payoh, Toa Payoh Ctrl and Lor 2 Toa Payoh.
		1981	31 October	Amended to ply Clementi Rd, skipping Old Clementi Rd.
		1986	1 June	Skips removed bus stop before Ayer Rajah Rd along Clementi Rd.
		1988	23 October	Amended to ply Commonwealth Ave West and Clementi Ave 6.
	Boon Lay ↔ Eunos	1990	1 July	Extended to Eunos Int and amended to Boon Lay Int.
		1996	TBC	Skips a pair of removed bus stops outside and opposite MOE Water Works along Jln Ahmad Ibrahim.
		1999	TBC	First bus from Boon Lay Int revised to 0530 hrs on weekdays and Saturdays, and 0600 hrs on Sundays and Public Holidays.
	154Boon Lay ↔ Eunos 154ACommonwealth Ave West → Clementi Rd	2001	TBC	154AIntroduced from Commonwealth Ave West (Clementi Stn) to Clementi Rd (Ngee Ann Poly) during morning peak hours on weekdays.
	154Boon Lay ↔ Eunos 154ABoon Lay → Clementi Rd		TBC	154AExtended to start from Boon Lay Int.
		2003	16 March	Amended to ply Eunos Ave 5 and Eunos Rd 8 with the partial closure of Paya Lebar Rd to facilitate the construction of Paya Lebar station on the Circle Line.
		2006	18 June	Amended to Boon Lay Temp Int.
		2008	26 October	Serves new bus stop along Jln Ubi.
		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.
			27 December	Amended to Boon Lay Integrated Transport Hub.
	Boon Lay ↔ Eunos	2010	TBC	154ADiscontinued.
		2011	26 June	Amended to ply Lor Bengkok with the closure of Circuit Lk to facilitate the construction of MacPherson station on the Downtown Line.
			4 September	Amended to skip Bendemeer Rd, Whampoa Nth and Serangoon Rd towards Boon Lay Int with the permanent closure of Whampoa Nth.
				Serves new bus stop outside Botanic Gdns Stn along Bt Timah Rd.
			26 September	Designated wheelchair-accessible bus service (WAB).
	154Boon Lay ↔ Eunos 154AYung Ho Rd → Boon Lay Way	2012	19 November	154AIntroduced from Yung Ho Rd (Blk 151) to Boon Lay Way (Lakeside Stn) during morning peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.
	154Boon Lay ↔ Eunos 154AYung Ho Rd → Boon Lay Way 154BCommonwealth Ave West → Clementi Rd	2014	6 January	154BIntroduced from Commonwealth Ave West (Clementi Stn) to Clementi Rd (Ngee Ann Poly) during morning peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.
		2016	16 October	Amended to ply the reinstated Circuit Lk, skipping Lor Bengkok.
	154Boon Lay ↔ Eunos 154AYung Ho Rd → Boon Lay Way 154BBoon Lay → Clementi Rd	2018	15 October	154BExtended to start from Boon Lay Int.

Service 154A

Operator	Route	Year	Date	Service changes
United Bus Company	New Bridge Rd ↔ Jln Besi	1971	11 April	Introduced between New Bridge Rd Ter and Jln Besi Ter under 1971 Bus Reorganisation.
	Crawford St ↔ Jln Besi		1 September	Extended to Crawford St Ter.
	Crawford St ↔ Benoi Rd		TBC	Extended to Benoi Rd Ter.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	3 February	Re-numbered Service 209 under 1974 Bus Rationalisation.

Service 155

Operator	Route	Year	Date	Service changes
Associated Bus Services	Kim Keat Ave ↔ Bedok Rd	1971	11 April	Introduced between Kim Keat Ave Ter and Bedok Rd Ter under 1971 Bus Reorganisation.
	Toa Payoh ↔ Bedok Rd		2 August	Amended to Toa Payoh Town Ctr Ter.
(Current) Known as prior to 1 November 2001		1973	1 July	Operations transferred to Singapore Bus Services.
	Toa Payoh ↔ Chai Chee	1974	3 February	Amended to Chai Chee Ter under 1974 Bus Rationalisation.
	Toa Payoh ↔ Upp Changi Rd 8¼ ms		1 December	Amended to Upp Changi Rd 13.3 km Ter.
		1975	2 March	Amended to ply Sims Ave towards Upp Changi Rd 13.3 km Ter with the conversion of Geylang Rd to one-way traffic.
		1979	TBC	Relocated to Upp Changi Rd 15.5km Ter.
			14 October	Amended to ply Still Rd and Joo Chiat Pl towards Upp Changi Rd 15.5 km Ter with the conversion of Changi Rd to one-way traffic.
	Toa Payoh ↔ Somapah Depot	1980	16 June	Amended to Somapah Depot.
			13 July	Amended to ply Toa Payoh East, Kim Keat Ave, Toa Payoh East, Lor 7 Toa Payoh, Lor 6 Toa Payoh, Toa Payoh East, Lor 5 Toa Payoh and Lor 4 Toa Payoh.
			28 December	Amended to ply Upp Changi Rd East, skipping Upp Changi Rd.
	Toa Payoh ↔ Somapah	1981	28 June	Amended to Somapah Int.
		1983	26 December	Amended to Toa Payoh Int.
		1986	7 December	Serves new bus stop before Bedok Sth Ave 3 along Upp East Coast Rd.
	Toa Payoh ↔ Marine Parade	1989	27 August	Shortened to Marine Parade Ter.
		1992	3 May	Amended to ply Geylang East Ctrl and Paya Lebar Rd under TransitLink Network Integration Exercise Phase 7.
		1993	TBC	Serves bus stop outside Eunos Stn along Sims Ave with the abolition of the bus stop after Eunos Cres.
		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.
	155Toa Payoh ↺ Siglap Rd 155AToa Payoh → Siglap Rd	2001	16 September	Amended to loop at Siglap Rd from Toa Payoh Temp Int with the closure of Marine Parade Ter.
				155AIntroduced from Toa Payoh Int to Siglap Rd (Opp Mandarin Gdns) as terminating trips after the last bus of Service 155 daily.
		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
		2003	16 March	Amended to ply Eunos Ave 5 and Eunos Rd 8 with the partial closure of Paya Lebar Rd to facilitate the construction of Paya Lebar station on the Circle Line.
			TBC	Serves new bus stop outside Victoria Sch along Marine Parade Rd.
	155Toa Payoh ↺ Siglap Rd 155AToa Payoh ↺ Siglap Rd → Marine Parade Rd	2005	25 April	155AExtended to terminate at Marine Parade Rd (Victoria Sch).
		2009	23 August	Amended to ply the reinstated Paya Lebar Rd, skipping Eunos Ave 5 and Eunos Rd 8.
		2011	26 June	Serves new staggered bus stop outside Kong Hwa Sch along Circuit Rd, skipping the bus stop outside MacPherson Sec Sch.
		2014	29 June	Designated wheelchair-accessible bus service (WAB).
		2016	16 October	Serves the bus stop outside MacPherson Sec Sch along Circuit Rd with the abolition of the bus stop outside Kong Hwa Sch.
		2017	12 March	Amended to ply Upp Serangoon Rd and the diverted Upp Aljunied Rd.
	Toa Payoh ↔ Bedok		9 April	Extended to Bedok Int.
				155ADiscontinued with the extension of Service 155 to Bedok Int.
		2019	14 April	Serves a new pair of bus stops outside and opposite Blk 3 along Bedok Sth Ave 1.
		2021	12 December	Serves new pair of bus stops before and after Heartbeat @ Bedok along Bedok Nth St 1.

Service 155A

Operator	Route	Year	Date	Service changes
Associated Bus Services	Lor 1 Toa Payoh ↔ Bedok Rd	1971	11 April	Introduced between Lor 1 Toa Payoh Ter and Bedok Rd Ter.
	Toa Payoh ↔ Bedok Rd		2 August	Amended to Toa Payoh Town Ctr Ter.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	3 February	Re-numbered Service 135 under 1974 Bus Rationalization.

Service 156

1^st Generation (1971 - 1983)

Operator	Route	Year	Date	Service changes
Associated Bus Services	Lor 1 Toa Payoh ↔ Upp Serangoon	1971	11 April	Introduced between Lor 1 Toa Payoh Ter and Upp Serangoon Ter under 1971 Bus Reorganisation.
	Toa Payoh ↔ Upp Serangoon		2 August	Amended to Toa Payoh Town Ctr Ter.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1983	6 February	Amended to ply CTE towards Upp Serangoon Ter with the closure of temporary slip road between Braddell Rd and Lor Chuan.
			20 June	Amended back to ply Lor Chuan towards Upp Serangoon Ter with the opening of new link road between Braddell Rd and Lor Chuan under Braddell Flyover.
			26 December	Integrated with Service 153 and discontinued.

2^nd Generation (since 1993)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Serangoon ↔ Clementi	1993	5 December	Introduced between Serangoon Int and Clementi Int under TransitLink Network Integration Exercise Phase 14.
	156Serangoon ↔ Clementi 156ASerangoon → Bishan Rd	2000	TBC	156AIntroduced from Serangoon Int to Bishan Rd (Bishan Stn) during morning peak hours on weekdays.
	Sengkang ↔ Clementi	2001	29 July	Extended to Sengkang Temp Int.
				156ADiscontinued with the extension of Service 156 to Sengkang Temp Int.
				First bus from Clementi Int brought forward to 0530 hrs on weekdays and Saturdays.
		2003	18 January	Amended to Sengkang Integrated Transport Hub.
	156Sengkang ↔ Clementi 156ASengkang → Thomson Rd		TBC	156AIntroduced from Sengkang Int to Thomson Rd (Mt Alvernia Hosp) during morning peak hours on weekdays.
	Sengkang ↔ Clementi	2004	TBC	156ADiscontinued.
	156Sengkang ↔ Clementi 156ABoundary Rd → Bishan Rd	2006	TBC	156AIntroduced from Boundary Rd (Blk 257A) to Bishan Rd (Bishan Stn) during morning peak hours on weekdays.
			29 October	Amended to Clementi Temp Int.
	Sengkang ↔ Clementi	2008	TBC	156ADiscontinued.
	156Sengkang ↔ Clementi 156ASengkang → Thomson Rd	2009	2 January	156AIntroduced from Sengkang Int to Thomson Rd (Opp Old Police Academy) during morning peak hours on weekdays.
		2011	4 September	Serves new bus stop outside Botanic Gdns Stn along Bt Timah Rd.
			26 September	Designated wheelchair-accessible bus service (WAB).
			26 November	Amended to Clementi Integrated Transport Hub.
	Sengkang ↔ Clementi	2013	8 April	156ADiscontinued.
		2015	27 December	Serves additional bus stop opposite Sixth Ave Stn along Dunearn Rd.
		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 Sengkang Integrated Transport Hub with the temporary closure of slip road to PIE Exit 17D, serving new staggered bus stop after Mt Pleasant Rd along Thomson Rd.
	Buangkok ↔ Clementi	2024	1 December	Shortened to Buangkok Integrated Transport Hub.

Service 157

Operator	Route	Year	Date	Service changes
United Bus Company	Lor 1 Toa Payoh ↔ Jln Samulun	1971	22 June	Introduced between Lor 1 Toa Payoh Ter and Jln Samulun Ter.
	Toa Payoh ↔ Jln Samulun		2 August	Amended to Toa Payoh Town Ctr Ter.
(Current) Known as prior to 1 November 2001		1973	1 July	Operations transferred to Singapore Bus Services.
		1975	9 November	Amended to realigned Jurong Rd, skipping Old Jurong Rd.
	Toa Payoh ↔ Jurong	1978	1 June	Amended to Jurong Int.
		1979	30 December	Amended to ply Jln Anak Bt towards Toa Payoh Town Ctr Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1983	26 December	Amended to Toa Payoh Int.
		1984	20 October	Amended to ply Bt Batok East Ave 3, Bt Batok St 24, Bt Batok St 23 and interim road with the partial closure of Jurong Rd (between Bt Batok East Ave 3 and Bt Batok St 23).
		1985	17 March	Amended to ply Bt Batok Rd, Bt Batok West Ave 3, Bt Batok Ctrl and Bt Batok East Ave 3 with the partial closure of Jurong Rd.
		1987	12 August	Skips removed bus stop after Joan Rd along Lornie Rd.
		1989	27 August	Amended to ply Jurong East Ave 1, Jurong West Ave 1 and Corporation Rd, skipping Jln Ahmad Ibrahim.
	Toa Payoh ↔ Boon Lay	1990	1 July	Amended to Boon Lay Int.
		1996	TBC	Serves new bus stop outside Blk 220 along Boon Lay Ave.
		1998	31 May	Amended to the Toa Payoh Temp Int.
				Serves new pair of bus stops outside and opposite Toa Payoh Swim Cplx along Lor 6 Toa Payoh.
		2001	23 December	Amended to ply Corporation Rd, Jurong West Ave 2 and Jln Boon Lay, skipping Boon Lay Ave.
		2002	19 May	Amended to the relocated Toa Payoh Integrated Transport Hub.
		2003	TBC	Serves new bus stop outside Goh & Goh Bldg along Jln Jurong Kechil.
		2005	TBC	Skips removed bus stop outside Muhajirin Mque along Braddell Rd.
		2006	18 June	Amended to Boon Lay Temp Int.
		2009	27 December	Amended to Boon Lay Integrated Transport Hub.
	157Toa Payoh ↔ Boon Lay 157ABoon Lay Int → Bt Batok Ctrl	2010	18 September	157AIntroduced from Boon Lay Int to Bt Batok Ctrl (Opp Blk 628) during the partial full day closure of the North South Line between Jurong East and Bukit Batok to facilitate the Jurong East Modification Project (JEMP) until 19 September 2010.
	Toa Payoh ↔ Boon Lay		20 September	157ADiscontinued.
		2012	9 December	Amended to ply Upp Bt Timah Rd and Bt Timah Lk with the partial closure of Jln Jurong Kechil to facilitate the construction of Beauty World on the Downtown Line.
		2013	30 September	Designated wheelchair-accessible bus service (WAB).
		2014	26 January	Amended to ply the reinstated Jln Jurong Kechil, skipping Upp Bt Timah Rd and Bt Timah Lk.
		2017	23 April	Serves relocated bus stop before PIE along Bt Batok Rd.
		2018	28 October	Amended to ply southbound Lornie Highway with the partial closure of Adam Rd.

Service 158

Operator	Route	Year	Date	Service changes
Associated Bus Services	Toa Payoh ↔ Fidelio St	1971	8 August	Introduced between Toa Payoh Town Ctr Ter and Fidelio St Ter.
(Current) Known as prior to 1 November 2001	Toa Payoh ↔ Chai Chee	1973	1 July	Operations transferred to Singapore Bus Services.
				Extended to Chai Chee Ter.
		1974	3 February	Amended to skip Fidelio St under 1974 Bus Rationalisation.
		1983	26 December	Amended to Toa Payoh Int.
	Toa Payoh ↔ Bedok	1985	8 September	Extended to Bedok Int with the closure of Chai Chee Ter.
	Serangoon ↔ Bedok	1990	4 February	Amended to Serangoon Int.
	Serangoon ↺ Rhu Cross	1992	3 May	Shortened to loop at Tg Rhu Rd under TransitLink Network Integration Exercise Phase 7.
		1998	TBC	Serves new bus stop opposite Costa Rhu Condo along Rhu Cross, skipping a pair of bus stops outside and opposite AMCOL along Tg Rhu Rd.
	158Serangoon ↺ Rhu Cross 158AGeylang Rd → Tg Rhu Rd 158BTg Rhu Rd → Sims Ave	2001	TBC	158AIntroduced from Geylang Rd (Gay World Pk) to Tg Rhu Rd (Opp Dunman High Sch) during morning peak hours on weekdays.
				158BIntroduced from Tg Rhu Rd (Dunman High Sch) to Sims Ave (Aft Lor 1 Geylang) during evening peak hours on weekdays.
		2003	16 March	Skips a pair of removed bus stops outside and opposite Camelot Condo along Tg Rhu Rd to facilitate the construction of KPE.
		2004	27 April	Amended to ply Geylang Rd, Kallang Rd and Sims Ave towards Serangoon Int with the temporary conversion of Lor 1 Geylang to one-way traffic.
			TBC	Serves additional pair of bus stops outside Serangoon Stn along Serangoon Ctrl.
			6 December	Amended to ply the reinstated Lor 1 Geylang towards Serangoon Int, skipping Geylang Rd, Kallang Rd and Sims Ave.
	158Serangoon ↺ Rhu Cross 158AAljunied Rd → Tg Rhu Rd 158BTg Rhu Rd → Sims Ave	2005	5 June	Amended to ply Sims Way with the partial closure of southbound Mountbatten Rd due to the construction of Paya Lebar station along the Circle Line.
				158AAmended to start from Aljunied Rd (Aljunied Stn).
	158Serangoon ↺ Rhu Cross 158AAljunied Rd → Tg Rhu Rd 158BTg Rhu Rd → Aljunied Rd		26 June	Amended to ply Sims Way with the partial closure of northbound Mountbatten Rd due to the construction of Mountbatten station along the Circle Line.
				158BAmended to terminate Aljunied Rd (Opp Aljunied Stn).
	Serangoon ↺ Rhu Cross	2006	20 November	158A 158BTemporary suspension of services due to the temporary relocation of Dunman High Sch to facilitate renovation works.
	158Serangoon ↺ Rhu Cross 158AAljunied Rd → Tg Rhu Rd 158BTg Rhu Rd → Aljunied Rd	2009	2 January	158A 158BServices reinstated with the re-opening of Dunman High Sch at its original site.
			8 March	Skips a pair of bus stops outside and opposite Bartley Sec Sch with the realignment of the junction of Upp Paya Lebar Rd and Bartley Rd.
			22 November	Serves new pair of bus stops outside and opposite MacPherson Stn along Circuit Lk.
		2011	26 June	Amended to ply Lor Bengkok with the closure of Circuit Lk to facilitate the construction of MacPherson station on the Downtown Line.
	158Serangoon ↺ Rhu Cross 158AAljunied Rd ↺ Rhu Cross → Aljunied Rd		1 August	158AIntegrated with Short Trip 158B, amended to loop at Rhu Cross and extended to operate during evening peak hours on weekdays.
				158BIntegrated with Short Trip 158A and discontinued.
			3 September	Amended to Serangoon Integrated Transport Hub.
		2013	31 March	Designated wheelchair-accessible bus service (WAB).
		2014	10 August	Serves new bus stop opposite Blk 2 along Mountbatten Rd.
		2016	16 October	Amended to ply the reinstated Circuit Lk, skipping Lor Bengkok.
		2024	28 April	Serves new bus stops outside Tg Rhu Stn along Tg Rhu Rd.

Service 159

1^st Generation (1971 - 1974)

Operator	Route	Year	Date	Service changes
United Bus Company	Toa Payoh Town Ctr ↔ Outram Pk	1971	11 August	Introduced between Toa Payoh Town Ctr Ter and Outram Pk Ter.
		1973	11 March	Amended to ply Zion Rd and Hoot Kiam Rd towards Toa Payoh Town Ctr Ter with the partial conversion of Kim Seng Rd and Irwell Bank Rd to one-way traffic.
			1 July	Operations transferred to Singapore Bus Services.
		1974	3 February	Integrated with Service 151 and discontinued under 1974 Bus Rationalisation.

2^nd Generation (since 1977)

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Toa Payoh ↔ Ang Mo Kio Ave 6	1977	25 April	Introduced between Toa Payoh Town Ctr Ter and Ang Mo Kio Ave 6 Ter.
	Toa Payoh ↺ Ang Mo Kio	1980	6 January	Amended to loop at Ang Mo Kio Ave 3 via Ang Mo Kio Ave 8.
		1983	6 February	Amended to ply CTE towards Ang Mo Kio Ave 3 with the closure of temporary slip road between Braddell Rd and Lor Chuan.
			10 April	Amended to loop at Ang Mo Kio Int.
			26 December	Amended to Toa Payoh Int.
		1989	5 March	Amended to ply Lor Chuan towards Ang Mo Kio Int, skipping CTE.
		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.
	Toa Payoh ↔ Sengkang	2001	18 February	Extended to Sengkang Ter.
	159Toa Payoh ↔ Sengkang 159ASengkang → Ang Mo Kio Ave 8		19 February	159AIntroduced from Sengkang Ter to Ang Mo Kio Ave 8 (Opp Blk 710) during morning peak hours on weekdays.
			28 April	Amended to Sengkang Temp Int.
		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
	159Toa Payoh ↺ Sengkang 159ASengkang → Ang Mo Kio Ave 8	2003	18 January	Amended to loop at Sengkang Integrated Transport Hub from Toa Payoh Int.
	Sengkang ↔ Toa Payoh	2005	TBC	Amended to terminate at Sengkang Integrated Transport Hub.
				159ADiscontinued.
	159Sengkang ↔ Toa Payoh 159ASengkang → Ang Mo Kio Ave 8	2009	6 April	159AIntroduced from Sengkang Int to Ang Mo Kio Ave 8 (Opp Blk 710) during morning peak hours on weekdays.
	159Sengkang ↔ Toa Payoh 159ASengkang → Ang Mo Kio Ave 8 159BAng Mo Kio Ave 8 → Ang Mo Kio Ave 5	2013	7 January	159BIntroduced from Ang Mo Kio Ave 8 (Jubilee) to Ang Mo Kio Ave 5 (ITE College Ctrl) during morning peak hours on weekdays.
		2015	30 March	Designated wheelchair-accessible bus service (WAB).

See also

• History of Bus Services