History of Services 151 - 160

Service 151 (1971 - 1989)

Operator	Route	Year	Date	Service changes
UBC	Kim Keat Ave ↔ South Canal (Apr - Aug 1971)	1971	11 April	Introduced between Kim Keat Ave Ter and Sth Canal Ter under 1971 Bus Reorganisation.
	Toa Payoh ↔ South Canal (Aug 1971 - 1974)		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.
	Toa Payoh ↔ Outram Pk (1974 - 1975)	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 - 1989)	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.

Service 151 (since 1993)

Operator	Route	Year	Date	Service changes
	Hougang South ↔ Kent Ridge (1993 - 2004)	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.
		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.
(Current)	Hougang Ctrl ↔ Kent Ridge (since 2004)	2004	15 February	Extended 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.

Short Trip 151A (2000 - 2012)

Operator	Year	Date	Service changes
	2000	TBC	Introduced from Kent Ridge Ter to Dunearn Rd (Aft Kheam Hock Rd) during evening peak hours on weekdays.
	2010	2 December	Designated wheelchair-accessible bus service (WAB).
	2012	23 July	Discontinued.

Service 152 (1971 - 2000)

Operator	Route	Year	Date	Service changes
ABS	Lor 1 Toa Payoh ↔ Telok Kurau Rd (Apr - Aug 1971)	1971	11 April	Introduced between Lor 1 Toa Payoh Ter and Telok Kurau Rd Ter under 1971 Bus Reorganisation.
	Toa Payoh ↔ Telok Kurau Rd (Aug 1971 - 1973)		2 August	Amended to Toa Payoh Town Ctr Ter.
	Toa Payoh ↔ Chai Chee (1973 - 1977)	1973	1 July	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 - 1979)	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 - 2000)	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
UBC	Lor 1 Toa Payoh ↔ Henderson Rd (Apr - Aug 1971)	1971	11 April	Introduced between Lor 1 Toa Payoh Ter and Jln Bt Merah Ter under 1971 Bus Reorganisation.
	Toa Payoh ↔ Henderson Rd (Aug 1971 - 1979)		2 August	Amended to Toa Payoh Town Ctr Ter.
	Toa Payoh ↔ Bukit Merah (1979 - 1983)	1979	23 December	Amended to Bt Merah Ctrl Ter.
		1980	28 September	Amended to Bt Merah Int.
	Upp Serangoon ↔ Bukit Merah (1983 - 1994)	1983	26 December	Integrated with Service 156 and extended to Upp Serangoon Ter.
		1992	29 March	Amended to ply Bt Merah Ctrl.
	Hougang Ctrl ↔ Bukit Merah (1994 - 1998)	1994	18 December	Amended to Hougang Ctrl Int.
	Hougang Ctrl Temp Int ↔ Bukit Merah (1998 - 2001)	1998	24 May	Amended to Hougang Ctrl Temp Int.
	Hougang Ctrl ↔ Bukit Merah (since 2001)	2001	20 May	Amended back to Hougang Ctrl Int.
(Current)		2002	TBC	Serves new pair of bus stops after Sommerville Rd and after Sunshine Lodge along Upp Serangoon Rd.
		2004	TBC	Skips removed bus stop outside Nanyang Pr Sch along Farrer Rd.
		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 (1971 - 1974)

Operator	Route	Year	Date	Service changes
UBC	Lor 1 Toa Payoh ↔ Henderson Rd (Jul - Aug 1971)	1971	19 July	Introduced between Lor 1 Toa Payoh Ter and Jln Bt Merah Ter.
	Toa Payoh ↔ Henderson Rd (Aug 1971 - 1974)		2 August	Amended to Toa Payoh Town Ctr Ter.
		1974	3 February	Integrated with Service 95 and discontinued under 1974 Bus Rationalisation.

Short Trip 153A (2002 - 2006)

Operator	Year	Date	Service changes
	2002	TBC	Introduced from Hougang Ctrl Int to Lor 2 Toa Payoh (Toa Payoh Stn) during morning peak hours on weekdays.
	2006	TBC	Discontinued.

Service 154

Operator	Route	Year	Date	Service changes
UBC	MacPherson ↔ Intl Rd (1971 - 1978)	1971	11 April	Introduced between MacPherson Ter and Intl Rd Ter under 1971 Bus Reorganisation.
	MacPherson ↔ Jurong (1978 - 1990)	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.
	Eunos ↔ Boon Lay (1990 - 2006)	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.
(Current)		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 MRT station on the Circle MRT Line.
	Eunos ↔ Boon Lay Temp Int (2006 - 2009)	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.
	Eunos ↔ Boon Lay (since 2009)		27 December	Amended to Boon Lay Integrated Transport Hub.
		2011	26 June	Amended to ply Lor Bengkok with the closure of Circuit Lk to facilitate the construction of MacPherson MRT station on the Downtown MRT Line.
			26 September	Designated wheelchair-accessible bus service (WAB).
			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.
		2016	16 October	Amended to ply the reinstated Circuit Lk, skipping Lor Bengkok.

Service 154A (1971 - 1974)

Operator	Route	Year	Date	Service changes
UBC	New Bridge Rd ↔ Jln Besi (Apr - Aug 1971)	1971	11 April	Introduced between New Bridge Rd Ter and Jln Besi Ter under 1971 Bus Reorganisation.
	Crawford St ↔ Jln Besi (Sep 1971 - 1971)		1 September	Extended to Crawford St Ter.
	Crawford St ↔ Benoi Rd (1971 - 1974)		TBC	Extended to Benoi Rd Ter.
		1974	3 February	Re-numbered Service 209 under 1974 Bus Rationalisation.

Short Trip 154A (2001 - 2010)

Operator	Route	Year	Date	Service changes
	Commonwealth Ave West → Clementi Rd (2001 - 2001)	2001	TBC	Introduced from Commonwealth Ave West (Clementi Stn) to Clementi Rd (Ngee Ann Poly) during morning peak hours on weekdays.
	Boon Lay → Clementi Rd (2001 - 2010)		TBC	Extended to start from Boon Lay Int.
		2006	18 June	Amended to Boon Lay Temp Int.
		2009	27 December	Amended to Boon Lay Integrated Transport Hub.
		2010	TBC	Discontinued.

Short Trip 154A (since 2012)

Operator	Route	Year	Date	Service changes
(Current)	Yung Ho Rd → Boon Lay Way (since 2012)	2012	19 November	Introduced from Yung Ho Rd (Blk 151) to Boon Lay Way (Lakeside Stn) during morning peak hours on weekdays. Wheelchair-accessible at launch.

Short Trip 154B

Operator	Route	Year	Date	Service changes
(Current)	Commonwealth Ave West → Clementi Rd (2014 - 2018)	2014	6 January	Introduced from Commonwealth Ave West (Clementi Stn) to Clementi Rd (Ngee Ann Poly) during morning peak hours on weekdays. Wheelchair-accessible at launch.
	Boon Lay → Clementi Rd (since 2018)	2018	15 October	Extended to start from Boon Lay Int.

Service 155

Operator	Route	Year	Date	Service changes
ABS	Kim Keat Ave ↔ Bedok Rd (Apr - Aug 1971)	1971	11 April	Introduced between Kim Keat Ave Ter and Bedok Rd Ter under 1971 Bus Reorganisation.
	Toa Payoh ↔ Bedok Rd (Aug 1971 - Feb 1974)		2 August	Amended to Toa Payoh Town Ctr Ter.
	Toa Payoh ↔ Chai Chee (Feb 1974 - Nov 1974)	1974	3 February	Amended to Chai Chee Ter under 1974 Bus Rationalisation.
	Toa Payoh ↔ Upp Changi Rd 8¼ ms (Dec 1974 - 1980)		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 - 1981)	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 - 1989)	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 - 2001)	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.
	Toa Payoh ↺ Siglap Rd (2001 - 2017)	2001	16 September	Amended to loop at Siglap Rd from Toa Payoh Temp Int with the closure of Marine Parade Ter.
(Current)		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 MRT station on the Circle MRT Line.
			TBC	Serves new bus stop outside Victoria Sch along Marine Parade Rd.
		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 (since 2017)		9 April	Extended 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 (1971 - 1974)

Operator	Route	Year	Date	Service changes
ABS	Lor 1 Toa Payoh ↔ Bedok Rd (Apr - Aug 1971)	1971	11 April	Introduced between Lor 1 Toa Payoh Ter and Bedok Rd Ter.
	Toa Payoh ↔ Bedok Rd (Aug 1971 - 1974)		2 August	Amended to Toa Payoh Town Ctr Ter.
		1974	3 February	Re-numbered Service 135 under 1974 Bus Rationalization.

Short Trip 155A (2001 - 2017)

Operator	Route	Year	Date	Service changes
	Toa Payoh → Siglap Rd (2001 - 2005)	2001	16 September	Introduced 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 MRT station on the Circle MRT Line.
	Toa Payoh → Marine Parade Rd (2005 - 2017)	2005	25 April	Extended 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.
			9 April	Discontinued with the extension of Service 155 to Bedok Int.

Service 156 (1971 - 1983)

Operator	Route	Year	Date	Service changes
ABS	Lor 1 Toa Payoh ↔ Upp Serangoon (Apr - Aug 1971)	1971	11 April	Introduced between Lor 1 Toa Payoh Ter and Upp Serangoon Ter under 1971 Bus Reorganisation.
	Toa Payoh ↔ Upp Serangoon (Aug 1971 - 1983)		2 August	Amended to Toa Payoh Town Ctr Ter.
		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.

Service 156 (since 1993)

Operator	Route	Year	Date	Service changes
	Serangoon ↔ Clementi (1993 - 2001)	1993	5 December	Introduced between Serangoon Int and Clementi Int under TransitLink Network Integration Exercise Phase 14.
	Sengkang ↔ Clementi (since 2001)	2001	29 July	Extended to Sengkang Temp Int.
				First bus from Clementi Int brought forward to 0530 hrs on weekdays and Saturdays.
(Current)		2003	18 January	Amended to Sengkang Integrated Transport Hub.
		2006	29 October	Amended to Clementi Temp Int.
		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.
		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	To be shortened to Buangkok Int.

Short Trip 156A (2000 - 2001)

Operator	Year	Date	Service changes
	2000	TBC	Introduced from Serangoon Int to Bishan Rd (Bishan Stn) during morning peak hours on weekdays.
	2001	29 July	Discontinued with the extension of Service 156 to Sengkang Temp Int.

Short Trip 156A (2003 - 2004)

Operator	Year	Date	Service changes
	2003	TBC	Introduced from Sengkang Int to Thomson Rd (Mt Alvernia Hosp) during morning peak hours on weekdays.
	2004	TBC	Discontinued.

Short Trip 156A (2006 - 2008)

Operator	Year	Date	Service changes
	2006	TBC	Introduced from Boundary Rd (Blk 257A) to Bishan Rd (Bishan Stn) during morning peak hours on weekdays.
	2008	TBC	Discontinued.

Short Trip 156A (2009 - 2013)

Operator	Year	Date	Service changes
	2009	2 January	Introduced from Sengkang Int to Thomson Rd (Opp Old Police Academy) during morning peak hours on weekdays.
	2011	26 September	Designated wheelchair-accessible bus service (WAB).
	2013	8 April	Discontinued.

Service 157

Operator	Route	Year	Date	Service changes
UBC	Lor 1 Toa Payoh ↔ Jln Samulun (Jun - Aug 1971)	1971	22 June	Introduced between Lor 1 Toa Payoh Ter and Jln Samulun Ter.
	Toa Payoh ↔ Jln Samulun (Aug 1971 - 1978)		2 August	Amended to Toa Payoh Town Ctr Ter.
		1975	9 November	Amended to realigned Jurong Rd, skipping Old Jurong Rd.
	Toa Payoh ↔ Jurong (1978 - 1990)	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 - 2006)	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 Toa Payoh Temp Int.
				Serves new pair of bus stops outside and opposite Toa Payoh Swim Cplx along Lor 6 Toa Payoh.
(Current)		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 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.
	Toa Payoh ↔ Boon Lay Temp Int (2006 - 2009)	2006	18 June	Amended to Boon Lay Temp Int.
	Toa Payoh ↔ Boon Lay (since 2009)	2009	27 December	Amended to Boon Lay Integrated Transport Hub.
		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 MRT station on the Downtown MRT 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.

Short Trip 157A (September 2010)

Operator	Year	Date	Service changes
	2010	18 September	Introduced from Boon Lay Int to Bt Batok Ctrl (Opp Blk 628) during the partial full day closure of the North South Line (NSL) to facilitate the Jurong East Modification Project (JEMP) until 19 September 2010.
		20 September	Discontinued.

Service 158

Operator	Route	Year	Date	Service changes
ABS	Toa Payoh ↔ Fidelio St (1971 - 1973)	1971	8 August	Introduced between Toa Payoh Town Ctr Ter and Fidelio St Ter.
	Toa Payoh ↔ Chai Chee (1973 - 1985)	1973	1 July	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 - 1990)	1985	8 September	Extended to Bedok Int with the closure of Chai Chee Ter.
	Serangoon ↔ Bedok (1990 - 1992)	1990	4 February	Amended to Serangoon Int.
	Serangoon ↺ Rhu Cross (since 1992)	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.
(Current)		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.
		2005	5 June	Amended to ply Sims Way with the partial closure of southbound Mountbatten Rd.
			26 June	Amended to ply Sims Way with the partial closure of northbound Mountbatten Rd.
		2009	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 MRT station on the Downtown MRT Line.
			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.

Short Trip 158A

Operator	Route	Year	Date	Service changes
	Geylang Rd → Tg Rhu Rd (2001 - 2005)	2001	TBC	Introduced from Geylang Rd (Gay World Pk) to Tg Rhu Rd (Opp Dunman High Sch) during morning peak hours on weekdays.
(Current)	Aljunied Rd → Tg Rhu Rd (2005 - 2006)	2005	5 June	Amended to ply Sims Way with the partial closure of southbound Mountbatten Rd.
				Amended to start from Aljunied Rd (Aljunied Stn).
	N/A	2006	20 November	Temporary suspension of service due to the temporary relocation of Dunman High Sch to facilitate renovation works.
	Aljunied Rd → Tg Rhu Rd (2009 - 2011)	2009	2 January	Service reinstated with the re-opening of Dunman High Sch at its original site.
	Aljunied Rd → Rhu Cross → Aljunied Rd (since 2011)	2011	1 August	Integrated with Short Trip 158B, amended to loop at Rhu Cross and extended to operate during evening peak hours on weekdays.
		2013	31 March	Designated wheelchair-accessible bus service (WAB).
		2014	10 August	Serves new bus stop opposite Blk 2 along Mountbatten Rd.
		2024	28 April	Serves new bus stops outside Tg Rhu Stn along Tg Rhu Rd.

Short Trip 158B (2001 - 2011)

Operator	Route	Year	Date	Service changes
	Tg Rhu Rd → Sims Ave (2001 - 2005)	2001	TBC	Introduced from Tg Rhu Rd (Dunman High Sch) to Sims Ave (Aft Lor 1 Geylang) during evening peak hours on weekdays.
		2004	27 April	Amended to ply Geylang Rd, Kallang Rd and Sims Ave with the temporary conversion of Lor 1 Geylang to one-way traffic.
			6 December	Amended to ply the reinstated Lor 1 Geylang, skipping Geylang Rd, Kallang Rd and Sims Ave.
	Tg Rhu Rd → Aljunied Rd (2005 - 2006)	2005	26 June	Amended to ply Sims Way with the partial closure of northbound Mountbatten Rd.
				Amended to terminate at Aljunied Rd (Opp Aljunied Stn).
	N/A	2006	20 November	Temporary suspension of service due to the temporary relocation of Dunman High Sch to facilitate renovation works.
	Tg Rhu Rd → Aljunied Rd (2009 - 2011)	2009	2 January	Service reinstated with the re-opening of Dunman High Sch at its original site.
		2011	1 August	Integrated with Short Trip 158A and discontinued.

Service 159 (1971 - 1974)

Operator	Year	Date	Service changes
UBC	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.
	1974	3 February	Integrated with Service 151 and discontinued under 1974 Bus Rationalisation.

Service 159 (since 1977)

Operator	Route	Year	Date	Service changes
	Toa Payoh ↔ Ang Mo Kio Ave 6 (1977 - 1980)	1977	25 April	Introduced between Toa Payoh Town Ctr Ter and Ang Mo Kio Ave 6 Ter.
	Toa Payoh ↺ Ang Mo Kio (1980 - 2001)	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 - 2003)	2001	18 February	Extended to Sengkang Ter.
			28 April	Amended to Sengkang Temp Int.
(Current)		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
	Toa Payoh ↺ Sengkang (2003 - 2005)	2003	18 January	Amended to loop at Sengkang Integrated Transport Hub from Toa Payoh Int.
	Toa Payoh ↔ Sengkang (since 2005)	2005	TBC	Amended to terminate at Sengkang Int.
		2015	30 March	Designated wheelchair-accessible bus service (WAB).

Short Trip 159A (2001 - 2005)

Operator	Year	Date	Service changes
	2001	19 February	Introduced 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.
	2003	18 January	Amended to Sengkang Integrated Transport Hub.
	2005	TBC	Discontinued.

Short Trip 159A (since 2009)

Operator	Route	Year	Date	Service changes
(Current)	Sengkang → Ang Mo Kio Ave 8 (since 2009)	2009	6 April	Introduced from Sengkang Int to Ang Mo Kio Ave 8 (Opp Blk 710) during morning peak hours on weekdays.
		2015	30 March	Designated wheelchair-accessible bus service (WAB).

Short Trip 159B

Operator	Route	Year	Date	Service changes
(Current)	Ang Mo Kio Ave 8 → Ang Mo Kio Ave 5 (since 2013)	2013	7 January	Introduced 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).

Service 160 (1971 - 1998)

Operator	Route	Year	Date	Service changes
UBC	Crawford St ↔ Rotherham Gate (1971 - 1976)	1971	11 April	Introduced between Crawford St Ter and Rotherham Gate Ter under 1971 Bus Reorganisation.
			6 November	Amended to ply Canberra Rd, skipping Admiralty Rd East.
		1974	3 February	Amended to ply Old Upp Thomson Rd under 1974 Bus Rationalisation.
	Crawford St ↔ Admiralty Rd West (1976 - 1998)	1976	23 August	Amended to Admiralty Rd West 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 Admiralty Rd West 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.
			25 November	Amended to ply Upp Thomson Rd, skipping Old Upp Thomson Rd.
		1983	3 April	Operations transferred to TIBS.
		1990	21 February	Skips removed bus stop opposite Jasmine Rd along Upp Thomson Rd.
		1996	10 February	Amended to ply Middle Rd towards Crawford St Ter and Jln Sultan, Beach Rd, Middle Rd, Victoria St, Rochor Rd and Rochor Canal Rd towards Admiralty Rd West Ter.
		1997	TBC	First bus from Admiralty Rd West Ter brought forward to 0600 hrs on Sundays and Public Holidays.
			TBC	Last bus from Crawford St Ter extended to 2330 hrs on weekdays.
		1998	27 December	Extended to Lor 1 Geylang Ter and re-numbered Service 980.

Service 160 (since 2004)

Operator	Route	Year	Date	Service changes
(Current)	Jurong East ↔ Kotaraya II (Johor Bahru) (2004 - 2014)	2004	5 September	Introduced between Jurong East Int and Kotaraya II Ter (Johor Bahru) as a cross border service, operating between 0530 hrs and 2400 hrs from Jurong East Int daily.
		2008	16 December	Serves additional bus stop outside JB Sentral along Jln Tun Abdul Razak towards Kotaraya II Ter.
		2009	5 July	Amended to ply Boon Lay Way with the closure of Jurong East St 12 to facilitate the Jurong East Modification Project (JEMP).
		2011	17 December	Amended to Jurong East Temp Int.
	Jurong East ↺ JB Sentral (Johor Bahru) (2014 - 2020)	2014	1 November	Amended to loop at Jln Tun Abdul Razak with the permanent closure of Kotaraya II Ter.
		2015	1 March	Amended to loop at JB Sentral Ter, skipping Jln Tun Abdul Razak.
		2016	11 December	Serves new bus stop opposite Blk 635A along Woodlands Rd.
		2017	23 April	Serves relocated bus stop before PIE along Bt Batok Rd.
			28 May	Skips removed bus stop opposite Mandai Rd along Woodlands Rd.
			21 August	Designated wheelchair-accessible bus service (WAB).
		2018	25 March	Amended to ply Woodlands Ave 3 and Woodlands Ctr Rd towards JB Sentral Ter.
			10 June	Serves new bus stop before Yew Tee Flyover along Woodlands Rd.
	Jurong East ↺ Woodlands Ctr Rd (2020 - 2022)	2020	18 March	Temporarily shortened to loop at Woodlands Ctr Rd due to Movement Control Order in Malaysia until 31 March 2020, skipping Woodlands Crossing, Johor Bahru and JB Sentral Ter.
			1 April	Temporary amendment to loop at Woodlands Ctr Rd due to Movement Control Order in Malaysia extended until 14 April 2020.
			15 April	Temporary amendment to loop at Woodlands Ctr Rd due to Movement Control Order in Malaysia extended until 28 April 2020.
			29 April	Temporary amendment to loop at Woodlands Ctr Rd due to Movement Control Order in Malaysia extended until 12 May 2020.
			13 May	Temporary amendment to loop at Woodlands Ctr Rd due to Movement Control Order in Malaysia extended until further notice.
			6 December	Amended to relocated Jurong East Temp Int.
	Jurong East ↺ JB Sentral (Johor Bahru) (2022 - 2023)	2022	1 May	Reinstated to loop at JB Sentral Ter.
	Jurong Town Hall ↺ JB Sentral (Johor Bahru) (since 2023)	2023	26 November	Extended to Jurong Town Hall Int.
				First bus brought forward to 0525 hrs daily.

Service 160A (1971 - 1974)

Operator	Year	Date	Service changes
UBC	1971	3 May	Introduced between Rotherham Gate Ter and New Bridge Rd Ter.
		10 August	Amended to ply Dunearn Rd, Bt Timah Rd, Newton Circus and Balmoral Rd.
	1974	3 February	Re-numbered Service 167 under 1974 Bus Rationalisation.

Short Trip 160A (since 2018)

Operator	Route	Year	Date	Service changes
(Current)	Jurong East → Bt Batok Rd (2018 - 2023)	2018	19 November	Introduced from Jurong East Temp Int to Bt Batok Rd (Opp Dunearn Sec Sch) during peak hours on weekdays. Wheelchair-accessible at launch.
		2020	6 December	Amended to relocated Jurong East Temp Int.
	Jurong Town Hall → Bt Batok Rd (since 2023)	2023	26 November	Extended to Jurong Town Hall Int.

Service 160M (2020 - 2023)

Operator	Year	Date	Service changes
	2020	26 July	Introduced as a supplementary service between Jurong East Temp Int and Bt Batok Rd (Loop). Wheelchair-accessible at launch.
		22 November	Serves a new bus stop outside Blk 460D along Bt Batok West Ave 9.
		6 December	Amended to relocated Jurong East Temp Int.
	2023	24 September	Amended to ply Bt Batok West Ave 8, Bt Batok West Ave 2 and Bt Batok Rd and re-numbered Service 993.