History of Services 150 - 159

Service 151

1st 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.

2nd Generation (Current)

Bus Service 151

Service 152 (1971 - 2000)

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 the relocated Toa Payoh Int (Temporary).
				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 (Current)

Bus Service 153

Service 153A (1971 - 1974)

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 (Current)

Bus Service 154

Service 154A (1971 - 1974)

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 (Current)

Bus Service 155

Service 155A (1971 - 1974)

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

1st 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.

2nd Generation (Current)

Bus Service 156

Service 157 (Current)

Bus Service 157

Service 158 (Current)

Bus Service 158

Service 159

1st 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.

2nd Generation (Current)

Bus Service 159

Service 160

1st Generation (1971 - 1998)

Operator	Route	Year	Date	Service changes
United Bus Company	Crawford St ↔ Rotherham Gate	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.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	3 February	Amended to ply Old Upp Thomson Rd under 1974 Bus Rationalisation.
	Crawford St ↔ Admiralty Rd West	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.
	Admiralty Rd West ↔ Crawford St	1983	3 April	Operations transferred to Trans Island Bus Services.
		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.

2nd Generation (Current)

Bus Service 160

Service 160A (1971 - 1974)

Operator	Route	Year	Date	Service changes
United Bus Company	Rotherham Gate ↔ New Bridge Rd	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.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	3 February	Re-numbered Service 167 under 1974 Bus Rationalisation.

Service 160M (2020 - 2023)

Bus Service 160M

Service 161

1st Generation (1971 - 1992)

Operator	Route	Year	Date	Service changes
United Bus Company	Sembawang Rd End ↔ Prince Edward	1971	11 April	Introduced between Sembawang Rd End Ter and Prince Edward Ter under 1971 Bus Reorganisation.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	8 December	Amended to ply Cecil St, skipping Robinson Rd.
		1976	14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
		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	11 February	Amended to ply the extended Shenton Way, Palmer Rd and Anson Rd, skipping Parsi Rd.
			28 October	Amended to ply Sungei Rd (towards Prince Edward Ter) and Bt Timah Rd (towards Sembawang Rd End 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.
		1983	8 May	Operations transferred to Trans Island Bus Services.
	Sembawang Rd End ↔ Shenton Way	1987	28 June	Amended to Shenton Way Ter.
		1990	21 February	Skips removed bus stop opposite Jasmine Rd along Upp Thomson Rd.
		1992	20 September	Integrated with Service 167 and discontinued under TransitLink Network Integration Exercise Phase 9.

2nd Generation (Current)

Bus Service 161

Service 162 (1971 - 1974)

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Crawford St Ter and Nee Soon Transit Camp (Loop) under 1971 Bus Reorganisation.
		5 July	Amended to ply Old Upp Thomson Rd.
	1974	3 February	Discontinued under 1974 Bus Rationalisation.

Service 162 (1977 - 1991)

Operator	Route	Year	Date	Service changes
	Ang Mo Kio Ave 6 ↺ Sims Ave (1977 - 1980)	1977	21 November	Introduced between Ang Mo Kio Ave 6 Ter and Sims Ave (Loop).
		1978	29 December	Coverted to a semi-express service and amended to ply Lor Chuan and Upp Serangoon Rd.
		1979	10 September	Serves all bus stops along Lor Chuan and Upp Serangoon Rd.
	Ang Mo Kio ↺ Sims Ave (1980 - 1991)	1980	6 January	Amended to Ang Mo Kio Ave 3 Ter.
		1981	10 May	Skips bus stop before Braddell Flyover along Braddell Rd.
			5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
		1982	11 June	Amended to ply Bendemeer Rd and Geylang Bahru, skipping Jln Kolam Ayer.
		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 Sims Ave.
		1986	16 March	Integrated with Service 77 and amended to ply Boundary Rd, Serangoon Ave 2 and Upp Serangoon Rd, skipping CTE and Braddell Rd.
		1991	6 January	Discontinued under TransitLink Network Integration Exercise Phase 1.

Service 162 (since 2001) / Short-Trip 162A (2004 - 2008)

Bus Service 162

Service 162X/162M (2001 - 2023)

Bus Service 162M

Service 163 / Short-Trip 163A / Short-Trip 163B

Bus Service 163

Service 163A (1971 - 1974)

Operator	Route	Year	Date	Service changes
UBC	Sembawang Hills Dr ↔ Prince Edward (Apr - Oct 1971)	1971	6 July	Introduced between Sembawang Hills Dr and Prince Edward Ter.
	Sembawang Hills Dr ↺ Tg Pagar Rd (Oct 1971 - 1974)		4 October	Extended to loop at Tg Pagar Rd.
		1974	3 February	Re-numbered Service 168 under 1974 Bus Rationalization.

Service 163M (2008 - 2019)

Bus Service 163M

Service 164 (1971 - 1989)

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Sembawang Rd End Ter and New Bridge Rd Ter under 1971 Bus Reorganisation.
	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 November	Operations transferred to SBS.
	1983	8 May	Operations transferred to TIBS.
	1987	6 June	Amended to the relocated New Bridge Rd Ter.
		1 November	Amended to ply Eu Tong Sen St towards Sembawang Rd End Ter to facilitate the second stage of road expansion along New Bridge Rd.
	1988	20 March	Amended to ply New Bridge Rd, skipping Upp Pickering St, Sth Bridge Rd and Neil Rd.
	1989	29 January	Serves relocated bus stop opposite Sri Mariamman Tp along Sth Bridge Rd, skipping a removed bus stop opposite Jamae Mque.
		1 October	Discontinued.

Service 165

Bus Service 165

Service 166 (1971 - 1974)

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Sembawang Rd End Ter and Nee Soon Rd (loop) under 1971 Bus Reorganisation.
	1974	3 February	Discontinued under 1974 Bus Rationalisation.

Service 166 (since 1976)

Bus Service 166

Service 167

Bus Service 167

Service 168 (1974 - 1989)

Operator	Route	Year	Date	Service changes
	Sembawang Hills Dr ↔ Tg Pagar Rd (1974 - 1976)	1974	3 February	Re-numbered from Service 163A as a service between Sembawang Hills Dr and Tg Pagar Rd Ter under 1974 Bus Rationalisation.
			24 February	Amended to ply Grange Rd, Orchard Blvd and Paterson Rd towards Sembawang Hills Dr with the conversion of Orchard Rd to one-way traffic.
	Ang Mo Kio Ave 6 ↺ South Canal (1976 - 1978)	1976	15 February	Extended to Ang Mo Kio Ave 6 Ter and amended to Sth Canal Ter.
	Ang Mo Kio Ave 6 ↺ Orchard Rd (1978 - 1979)	1978	29 December	Shortened to loop at Orchard Rd from Ang Mo Kio Ave 6 Ter and converted to semi-express service.
	Ang Mo Kio ↺ Orchard Rd (1979 - 1989)	1979	12 August	Amended to Ang Mo Kio Ave 3 Ter.
			15 October	Amended to ply Marymount Rd.
		1981	5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
		1983	10 April	Amended to Ang Mo Kio Int.
		1987	13 December	Serves new staggered bus stop outside Orchard Stn along Orchard Blvd, skipping the bus stop opposite Orchard Stn.
				Serves new bus stop outside Newton Stn along Scotts Rd.
		1989	11 June	Discontinued.

Service 168 / Short-Trip 168A

Bus Service 168

Service 169 / Short-Trip 169A / Short-Trip 169B

Bus Service 169

Service 170 / Short-Trip 170A

Bus Service 170

Service 170X

Bus Service 170X

Service 171

Bus Service 171

Service 172

Bus Service 172

Service 173

Bus Service 173

Service 174 / Short-Trip 174A (2010)

Bus Service 174

Service 175 (1971 - 1991)

Operator	Route	Year	Date	Service changes
UBC	Upp Jurong Rd ↔ Prince Edward (1971 - 1983)	1971	11 April	Introduced between Upp Jurong Rd Ter and Prince Edward Ter under 1971 Bus Reorganisation.
		1974	8 December	Amended to ply Cecil St, skipping Robinson Rd.
		1975	9 November	Amended to realigned Jurong Rd, skipping Old Jurong Rd.
		1979	11 February	Amended to ply the extended Shenton Way, Palmer Rd and Anson Rd, skipping Parsi Rd.
			28 October	Amended to ply Sungei Rd towards Prince Edward Ter with the conversion of Rochor Canal Rd to one-way traffic.
			30 December	Amended to ply Jln Anak Bt towards Prince Edward Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1980	2 January	Amended to the relocated Upp Jurong Rd Ter along Jln Ahmad Ibrahim.
			TBC	Amended to ply Bt Timah Rd towards Upp Jurong Rd Ter, skipping Mackenzie Rd.
	Pioneer Rd ↔ Prince Edward (1983 - 1987)	1983	30 October	Amended to Pioneer Rd Ter.
		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.
			30 November	Amended to ply along the new carriageway of Upp Jurong Rd (between Jln Boon Lay and Benoi Rd).
		1986	4 May	Amended to skip Jurong Cres.
	Pioneer Rd ↔ Shenton Way (1987 - 1989)	1987	28 June	Amended to Shenton Way Ter.
		1989	23 July	Serves new pair of bus stops near Pioneer Rd along Tuas Rd.
	Bukit Batok ↺ Tuas Rd (1989 - 1990)		6 November	Shortened to start from Bt Batok Int and loop at Tuas Rd.
	Bukit Batok ↺ Jurong West St 91 (1990 - 1991)	1990	7 July	Shortened to loop at Jurong West St 91, skipping Tuas Rd.
		1991	20 January	Discontinued under TransitLink Network Integration Exercise Phase 2.

Service 175 (1993 - 2005)

Operator	Year	Date	Service changes
	1993	18 July	Introduced between Lim Chu Kang Ter and Upp Bt Timah Rd (Loop).
	1994	TBC	Amended to ply Sg Tengah Rd with the partial closure of Choa Chu Kang Rd.
	1997	TBC	Serves new bus stop outside Lot 1 Shoppers' Mall along Choa Chu Kang Ave 4.
	1998	TBC	Serves new pair of bus stops outside and opposite Blk 464 along Choa Chu Kang Ave 3.
	1999	26 December	Operations transferred to TIBS.
	2001	TBC	Serves new bus stop outside Sunshine Pl along Choa Chu Kang Ave 3.
	2005	27 February	Amended to start from Bt Panjang Int, loop at Lim Chu Kang Rd and re-numbered Service 975, skipping Choa Chu Kang Int and Upp Bt Timah Rd.

Service 175 (since 2007)

Bus Service 175

Service 175A (1980 - 1983)

Operator	Year	Date	Service changes
	1980	2 January	Introduced between Upp Jurong Rd Ter and Tuas Village (Loop).
	1983	30 October	Discontinued.

Service 176 (1971 - 1983)

Operator	Route	Year	Date	Service changes
UBC	Corporation Dr ↔ Prince Edward (1971 - 1974)	1971	11 April	Introduced between Corporation Dr Ter and Prince Edward Ter under 1971 Bus Reorganisation.
	Corporation Dr ↔ Crawford St (1974 - 1977)	1974	3 February	Extended to Crawford St Ter under 1974 Bus Rationalisation.
			8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1976	15 February	Serves new staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
			14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
	Boon Lay Gardens ↔ Crawford St (1977 - 1978)	1977	28 March	Extended to Boon Lay Gdns Ter.
		1978	15 January	Amended to ply Jln Sultan and Beach Rd.
	Clementi ↔ Crawford St (1978 - 1979)		1 June	Shortened to Clementi Ter with the opening of Jurong Int.
		1979	11 February	Amended to ply the extended Shenton Way towards Clementi Ter, skipping Parsi Rd and Anson Rd.
	Clementi ↺ Empress Pl (1979 - 1983)		25 November	Shortened to loop at Empress Pl from Clementi Ter.
		1980	16 November	Amended to Clementi Int.
		1981	21 June	Amended to skip Nepal Circus towards Empress Pl.
			11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
		1983	26 December	Integrated with Service 146 and discontinued.

Service 176 (since 1988)

Bus Service 176

Service 177 (1978 - 1988)

Operator	Year	Date	Service changes
	1978	27 November	Introduced between Bt Timah Ter and Choa Chu Kang Rd End (Loop).
	1979	30 December	Amended to ply Jln Anak Bt towards Bt Timah Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
	1987	19 April	Serves new staggered bus stop under the PIE Flyover along Jln Anak Bt, skipping the bus stop opposite Bt Timah Plaza.
	1988	31 July	Discontinued.

Service 177 (since 1989) / Short-Trip 177A (2012 - 2016)

Bus Service 177

Service 178 / Short-Trip 178A

Bus Service 178

Service 179 (1974 - 1983)

Operator	Year	Date	Service changes
	1974	3 February	Introduced between Lim Chu Kang Ter and Bt Timah Ter under 1974 Bus Rationalisation.
	1978	27 November	Amended to skip Choa Chu Kang Rd End with the introduction of Service 177.
	1979	30 December	Amended to ply Jln Anak Bt towards Bt Timah Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
	1983	27 November	Discontinued.

Service 179 (1985 - 1990)

Operator	Route	Year	Date	Service changes
	Bukit Batok ↔ New Bridge Rd (1985 - 1988)	1985	18 August	Introduced between Bt Batok Ter and New Bridge Rd Ter.
		1987	6 June	Amended to the relocated New Bridge Rd Ter.
			27 September	Amended to Bt Batok Int.
				Amended to ply the extended Eu Tong Sen St towards Bt Batok Int to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Bt Batok 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.
	Choa Chu Kang ↔ New Bridge Rd (1988 - 1990)		18 December	Extended to Choa Chu Kang Ter and amended to ply Scotts Rd and Orchard Rd.
		1990	7 January	Serves new pair of bus stops outside and opposite Bt Batok Driving Ctr along Bt Batok West Ave 5.
			10 March	Extended to interim terminal along Choa Chu Kang Ave 4.
			8 April	Amended to Choa Chu Kang Int.
			16 December	Integrated with Service 190 and discontinued.

Service 179 (1993 - 1999)

Operator	Year	Date	Service changes
	1993	3 January	Introduced between Choa Chu Kang Int and Fajar Rd (Loop) under TransitLink Network Integration Exercise Phase 11.
	1995	2 July	Operations transferred to TIBS.
	1999	26 December	Discontinued under Bukit Panjang LRT Rationalisation.

Service 179 (since 2001)

Bus Service 179

Service 179A

Bus Service 179A

Service 180 (April - May 1971)

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Bt Timah Ter and Prince Edward Ter under 1971 Bus Reorganisation.
		9 May	Integrated with Service 180A, amended to ply Stamford Rd, Waterloo St and Bras Basah Rd and re-numbered Service 180/180A.

Service 180 (1974 - 1991)

Operator	Route	Year	Date	Service changes
	Upp Bt Timah Rd ↔ Tg Pagar Rd (1974 - 1976)	1974	3 February	Re-numbered from Service 180/180A as a service between Upp Bt Timah Rd Ter and Tg Pagar Ter under 1974 Bus Rationalisation.
			8 December	Amended to ply Cecil St, skipping Robinson Rd.
		1975	19 July	Amended to ply Coleman St and Hill St, skipping Stamford Rd.
	Marsiling ↔ Tg Pagar Rd (1976 - 1979)	1976	11 January	Extended to Admiralty Rd Ter.
		1979	11 February	Amended to ply the extended Shenton Way, Rambau St and Trafalgar St towards Tg Pagar Ter, skipping Parsi Rd.
	Marsiling ↔ Anson Rd (1979 - 1985)		1 August	Amended to Anson Rd Ter.
			25 November	Amended to ply Pickering St and Church St, skipping Nth Canal Rd and Market St.
			30 December	Amended to ply Jln Anak Bt towards Anson Rd Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1983	7 August	Operations transferred to TIBS.
	Marsiling ↔ World Trade Ctr (1985 - 1991)	1985	13 January	Extended to World Trade Ctr Ter.
		1990	19 August	Amended to ply Bt Timah Rd, Sungei Rd, Bencoolen St, Orchard Rd, Penang Rd and Clemenceau Ave (towards World Trade Ctr Ter) / Orchard Rd, Dhoby Ghaut, Selegie Rd and Bt Timah Rd due to the partial closure of Clemenceau Ave to facilitate Phase 2 of the construction of CTE.
		1991	6 January	Discontinued under TransitLink Network Integration Exercise Phase 1.

Service 180/180A (1971 - 1974)

Operator	Year	Date	Service changes
UBC	1971	9 May	Re-numbered from Service 180 between Bt Timah Ter and Prince Edward Ter.
	1974	3 February	Extended to Upp Bt Timah Rd Ter, extended to Tg Pagar Ter, amended to skip Stamford Rd, Waterloo St and Bras Basah Rd and re-numbered Service 180 under 1974 Bus Rationalisation.

Service 180A (1971 - 1974)

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Bt Timah Ter and Stamford Rd (Loop) under 1971 Bus Reorganisation.
		9 May	Integrated with Service 180 and discontinued.

Service 180 (since 1996) / Short-Trip 180A

Bus Service 180

Service 181 (1971 - 1998)

Operator	Route	Year	Date	Service changes
UBC	Bukit Timah ↔ Commonwealth Ave (Apr - Nov 1971)	1971	11 April	Introduced between Bt Timah Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
			28 September	Amended to ply the extended Ganges Ave towards Bt Timah Ter.
	Upp Bt Timah Rd ↔ Commonwealth Ave (Nov 1971 - 1974)		8 November	Extended to Upp Bt Timah Rd 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.
	Upp Bt Timah Rd ↔ Crawford St (1974 - 1980)	1974	3 February	Extended to Crawford St Ter under 1974 Bus Rationalisation.
		1979	30 December	Amended to ply Jln Anak Bt towards Crawford St Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
	Woodlands Ctr ↔ Crawford St (1980 - 1996)	1980	14 December	Extended to Woodlands Town Ter.
		1981	29 November	Amended to Woodlands Int.
		1983	4 September	Operations transferred to TIBS.
		1987	27 September	Amended to ply the extended Eu Tong Sen St towards Crawford St Ter to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Crawford St Ter to facilitate the second stage of road expansion along New Bridge Rd.
			13 December	Serves new staggered bus stop opposite Peninsula Plaza along Nth Bridge Rd, skipping the bus stop outside St Andrew's Cath.
		1988	28 February	Revised to operate on weekdays and Saturdays only with the introduction of Service 181#.
			20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
		1990	22 July	Serves additional bus stop outside Ellenborough Mkt along Eu Tong Sen St.
	Woodlands ↔ Crawford St (1996 - 1998)	1996	4 February	Amended to Woodlands Reg Int.
		1997	TBC	First bus from Woodlands Reg Int brought forward to 0530 hrs.
			TBC	Serves additional bus stop after Jln Bt Merah along Kg Bahru Rd.
			7 December	Amended to ply Sth Bridge Rd, Neil Rd and Cantonment Rd with the partial closure of New Bridge Rd to facilitate the construction of Chinatown MRT station on the North East MRT Line.
		1998	27 December	Extended to Lor 1 Geylang Ter and re-numbered Service 961.

Service 181 (since 2005)

Bus Service 181

Service 181#

Operator	Route	Year	Date	Service changes
	Woodlands Ctr ↔ Crawford St (1988 - 1996)	1988	28 February	Introduced between Woodlands Int and Crawford St Ter as an alternate route of Service 181 via Marina Centre, operating on Sundays and Public Holidays.
			20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
		1990	22 July	Serves additional bus stop outside Ellenborough Mkt along Eu Tong Sen St.
	Woodlands ↔ Crawford St (1996 - 1998)	1996	4 February	Amended to Woodlands Reg Int.
		1997	TBC	Serves additional bus stop after Jln Bt Merah along Kg Bahru Rd.
			7 December	Amended to ply Sth Bridge Rd, Neil Rd and Cantonment Rd with the partial closure of New Bridge Rd to facilitate the construction of Chinatown MRT station on the North East MRT Line.
		1998	27 December	Extended to Lor 1 Geylang Ter and re-numbered Service 961#.

Service 181M

Bus Service 181M

Service 182 (1971 - 1996)

Operator	Route	Year	Date	Service changes
UBC	Bukit Timah ↔ Jln Besi (Apr 1971 - 1971)	1971	11 April	Introduced between Bt Timah Ter and Jln Besi Ter under 1971 Bus Reorganisation.
	Bukit Timah ↔ Benoi Rd (1971 - 1974)		TBC	Extended to Benoi 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.
	Bukit Timah ↺ Shenton Way (1974 - 1976)	1974	3 February	Amended to loop at Shenton Way from Bt Timah Ter under 1974 Bus Rationalisation.
			24 February	Amended to ply Grange Rd, Orchard Blvd and Paterson Rd towards Bt Timah Ter with the conversion of Orchard Rd to one-way traffic.
			8 December	Amended to ply Cecil St, skipping Robinson Rd.
	Marsiling ↔ New Bridge Rd (1976 - 1993)	1976	6 June	Extended to Admiralty Rd Ter and amended to New Bridge Rd Ter.
		1979	30 December	Amended to ply Jln Anak Bt towards New Bridge Rd Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1983	7 August	Operations transferred to TIBS.
		1987	6 June	Amended to the relocated New Bridge Rd Ter.
			27 September	Amended to ply the extended Eu Tong Sen St towards Marsiling Ter to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Marsiling Ter to facilitate the second stage of road expansion along New Bridge Rd.
			13 December	Serves new staggered bus stop outside Orchard Stn along Orchard Blvd, skipping the bus stop opposite Orchard Stn.
				Serves new bus stop outside Newton Stn along Scotts Rd.
		1988	20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
		1992	19 July	Amended to ply Orchard Lk due to the closure of Grange Rd to facilitate road expansion works.
	Marsiling ↔ Shenton Way (1993 - Feb 1996)	1993	3 January	Amended to Shenton Way Ter under TransitLink Network Integration Exercise Phase 7.
		1995	7 May	Amended to ply Orchard Turn.
	Woodlands ↔ Shenton Way (Feb - Mar 1996)	1996	4 February	Amended to Woodlands Reg Int.
			10 March	Discontinued under Woodlands MRT Rationalisation.

Service 182 (since 1998) / Short-Trip 182A / Service 182X/182M

Bus Service 182/182M

Service 183 (1974 - 1988)

Operator	Route	Year	Date	Service changes
	Benoi Rd ↔ South Canal (1974 - 1978)	1974	3 February	Introduced between Benoi Rd Ter and Sth Canal 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.
	Jurong ↔ New Bridge Rd (1978 - 1988)	1978	1 June	Amended to Jurong Int and amended to New Bridge Rd Ter.
		1987	6 April	Skips removed bus stop before College Rd along Outram Rd.
			6 June	Amended to the relocated New Bridge Rd Ter.
			1 November	Amended to ply Eu Tong Sen St towards Jurong Int to facilitate the second stage of road expansion along New Bridge Rd.
		1988	11 January	Serves merged bus stop along Ayer Rajah Rd.
			18 December	Discontinued.

Service 183 (1998 - 2002)

Operator	Route	Year	Date	Service changes
	Tuas ↺ Tuas South Ave 6 (1998 - 2001)	1998	19 July	Introduced between Tuas Ter and Tuas Sth Ave 6 (Loop).
	Tuas ↺ Tuas South Ave 9 (2001 - 2002)	2001	11 February	Extended to loop at Tuas Sth Ave 9, skipping Tuas Sth Ave 6.
		2002	26 May	Integrated with Service 182/182X and discontinued.

Service 183 (since 2004) / Short-Trip 183A (2005 - 2012) / 183B

Bus Service 183

Service 184 (1977 - 1990)

Operator	Route	Year	Date	Service changes
	Telok Blangah Way ↔ Boon Lay Gardens (1977 - 1978)	1977	25 November	Introduced between Telok Blangah Way Ter and Boon Lay Gdns Ter.
	Telok Blangah Way ↔ Jurong (1978 - 1980)	1978	1 June	Amended to Jurong Int.
	Bukit Merah ↔ Jurong (1980 - 1990)	1980	28 September	Amended to Bt Merah Int.
		1981	15 February	Amended to skip Telok Blangah Way and Telok Blangah Cres in both directions.
		1987	2 August	Amended to ply West Coast Highway, skipping Upp Ayer Rajah Rd and Clementi Rd.
		1990	1 July	Integrated with Service 176 and discontinued with the opening of Boon Lay Int.

Service 184 (since 1994) / Short-Trip 184A (2000 - 2003)

Bus Service 184

Service 185 (1979 - 1985)

Operator	Route	Year	Date	Service changes
	Clementi ↺ North Buona Vista Rd (Jul - Nov 1979)	1979	16 July	Introduced between Clementi Ter and Nth Buona Vista Rd (Loop).
	Clementi ↺ Bt Merah Ctrl (Nov 1979 - 1980)		25 November	Extended to loop at Bt Merah Ctrl.
	Clementi ↺ Bukit Merah (1980 - 1985)	1980	28 September	Extended to loop at Bt Merah Int.
			16 November	Amended to Clementi Int.
		1981	21 June	Amended to skip Nepal Circus towards Bt Merah Int.
		1985	28 April	Integrated with Service 92 and discontinued.

Service 185 (1988 - 2003)

Operator	Route	Year	Date	Service changes
	Choa Chu Kang ↔ Shenton Way (1988 - 1993)	1988	31 July	Introduced between Choa Chu Kang Ter and Shenton Way Ter.
			25 August	Amended to ply Choa Chu Kang Ave 1 with the completion of the road junction between Teck Whye Ave and Choa Chu Kang Ave 1.
		1989	28 May	Amended to ply Commonwealth Ave.
		1990	10 March	Extended to interim terminal along Choa Chu Kang Ave 4.
			8 April	Amended to Choa Chu Kang Int.
		1991	28 April	Amended to ply Bt Batok East Ave 2 under TransitLink Network Integration Exercise Phase 4, skipping Bt Batok East Ave 3.
	Choa Chu Kang ↺ Jln Anak Bt (1993 - 2003)	1993	3 January	Shortened to loop at Jln Anak Bt from Choa Chu Kang Int with the introduction of Service 186 under TransitLink Network Integration Exercise Phase 11.
		1997	TBC	Serves new bus stop outside Lot 1 Shoppers' Mall along Choa Chu Kang Ave 4.
		1999	29 August	Operations transferred to TIBS.
				First bus brought forward to 0530 hrs on Sundays & Public Holidays.
		2003	TBC	Serves new bus stop outside Goh & Goh Bldg along Jln Jurong Kechil.
			27 July	Integrated with Service 989 to form Service 985 and discontinued.

Service 185 (since 2006)

Bus Service 185

Service 186 (1977 - 1989)

Operator	Route	Year	Date	Service changes
	Clementi ↔ Tg Pagar Rd (1977 - 1979)	1977	7 November	Introduced between Clementi Ter and Tg Pagar Rd Ter.
		1978	5 June	Amended to relocated roadside terminus along Clementi Ave 3 via Commonwealth Ave West, skipping Clementi Ave 2.
	Clementi ↔ Anson Rd (1979 - 1985)	1979	1 August	Amended to Anson Rd Ter.
		1980	16 November	Amended to Clementi Int.
	Clementi ↔ Prince Edward (1985 - 1987)	1985	27 January	Amended to Prince Edward Ter with the closure of Anson Rd Ter.
	Clementi ↔ Shenton Way (1987 - 1989)	1987	28 June	Amended to Shenton Way Ter.
		1988	8 March	Amended to ply Clementi Ave 3 with the abolition of right turning from Clementi Ave 3 to Commonwealth Ave West.
		1989	27 August	Integrated with Service 145 and discontinued.

Service 186 (since 1993)

Bus Service 186

Service 187 (1981 - 1983)

Operator	Year	Date	Service changes
	1981	15 February	Introduced as a day service between Bt Merah Int and Empress Pl (Loop).
		19 May	Converted to peak hour service on weekdays and Saturdays.
	1983	14 November	Discontinued.

Service 187 (since 1988) / Short-Trip 187A (2003 - 2004)

Bus Service 187

Service 188 (1977 - 1987)

Operator	Year	Date	Service changes
	1977	17 October	Introduced between Ulu Pandan Ter and Shenton Way (Loop), replacing the deleted sectors of Service 94.
	1979	11 February	Amended to ply the extended Shenton Way towards Ulu Pandan Ter, skipping Parsi Rd and Anson Rd.
	1980	20 January	Amended to ply Spottiswoode Pk Rd with the partial conversion of Cantonment Rd to one-way traffic.
	1981	11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
	1987	6 April	Skips removed bus stop before College Rd along Outram Rd.
		5 July	Discontinued.

Service 188 (1988 - 1991)

Operator	Route	Year	Date	Service changes
	Jurong ↺ Jurong West St 91 (1988 - 1990)	1988	10 July	Introduced between Jurong Int and Jurong West St 91 (Loop).
		1989	17 December	Amended to ply Jurong West St 72 and Jurong West Ave 5, skipping Pioneer Rd Nth.
	Corporation Dr ↺ Jurong West St 91 (1990 - 1991)	1990	1 July	Amended to start/terminate at Corporation Dr with the opening of Boon Lay Int.
		1991	20 January	Discontinued under TransitLink Network Integration Exercise Phase 2.

Service 188 (since 1999) / Short-Trip 188A (July - September 2010)

Bus Service 188

Service 189 / Short-Trip 189A

Bus Service 189

Service 189A (2001 - 2003)

Operator	Year	Date	Service changes
	2001	15 April	Introduced between Bt Batok Int and Harbour Dr (Loop), operating at selected timings only.
	2003	4 May	Discontinued.

Service 190 (April - May 1971)

Operator	Year	Date	Service changes
ABC	1971	11 April	Introduced between Delta Circus Ter and Sth Canal Ter under 1971 Bus Reorganisation.
		25 April	Integrated with Service 193/193A and discontinued.

Service 190 (1974 - 1979)

Operator	Year	Date	Service changes
	1974	3 February	Re-numbered from Service 191A between Jln Bt Merah Ter and Prince Edward Ter under 1974 Bus Rationalisation.
		24 February	Amended to ply Grange Rd, Orchard Blvd and Paterson Rd towards Jln Bt Merah Ter with the conversion of Orchard Rd to one-way traffic.
		8 December	Amended to ply Cecil St, skipping Robinson Rd.
	1976	14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
	1977	19 June	Amended to ply Orchard Blvd and Grange Rd towards Jln Bt Merah Ter with the full conversion of Orchard Rd to one-way traffic.
	1979	11 February	Amended to ply the extended Shenton Way, Palmer Rd and Anson Rd, skipping Parsi Rd.
		25 November	Integrated with Service 14 and discontinued.

Service 190 (since 1988) / Short-Trip 190A

Bus Service 190

Service 191 (1971 - 1983)

Operator	Route	Year	Date	Service changes
STC	Ulu Pandan ↔ Prince Edward (1971 - 1977)	1971	11 April	Introduced between Ulu Pandan Ter and Prince Edward Ter under 1971 Bus Reorganisation.
ABS			6 December	Operations transferred to ABS.
		1974	24 February	Amended to ply Grange Rd, Orchard Blvd and Paterson Rd towards Ulu Pandan Ter with the conversion of Orchard Rd to one-way traffic.
			8 December	Amended to ply Cecil St, skipping Robinson Rd.
		1976	14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
		1977	19 June	Amended to ply Orchard Blvd and Grange Rd towards Ulu Pandan Ter with the full conversion of Orchard Rd to one-way traffic.
	Clementi ↔ Prince Edward (1977 - Jun 1981)		1 August	Extended to Clementi Ter.
		1978	5 June	Amended to relocated terminus along Clementi Ave 3.
		1979	11 February	Amended to ply the extended Shenton Way, Palmer Rd and Anson Rd, skipping Parsi Rd.
		1980	16 November	Amended to Clementi Int.
	Clementi ↺ North Bridge Rd (Jun - Sep 1981)	1981	15 June	Shortened to loop at Nth Bridge Rd from Clementi Int with the introduction of Service 75, skipping Shenton Way.
	Clementi ↺ Nicoll Highway (Sep 1981 - 1983)		20 September	Extended to loop at Nicoll Highway.
		1983	30 October	Integrated with Service 7 and discontinued.

Service 191 (since 1988)

Bus Service 191

Service 191A (1971 - 1974)

Operator	Route	Year	Date	Service changes
STC	Commonwealth Ave ↔ Prince Edward (Apr - May 1971)	1971	11 April	Introduced between Commonwealth Ave Ter and Prince Edward Ter under 1971 Bus Reorganisation.
	Henderson Rd ↔ Prince Edward (May 1971 - 1974)		2 May	Shortened to Jln Bt Merah Ter.
ABS			6 December	Operations transferred to ABS.
		1974	3 February	Re-numbered Service 190 under 1974 Bus Rationalisation.

Service 192 (1971 - 1974)

Operator	Year	Date	Service changes
ABC	1971	11 April	Introduced between Commonwealth Ave Ter and Sth Canal Ter under 1971 Bus Reorganisation.
	1974	3 February	Discontinued under 1974 Bus Rationalisation.

Service 192 (1974 - 1988)

Operator	Route	Year	Date	Service changes
	Pasir Panjang Rd ↔ South Canal (1974 - 1979)	1974	3 February	Re-numbered from Service 192A as a service between Pasir Panjang Rd Ter and Sth Canal Ter under 1974 Bus Rationalisation.
		1979	11 November	Amended to ply Ganges Ave towards Pasir Panjang Rd Ter with the realignment of Delta Circus.
	Jurong ↔ South Canal (1979 - 1988)		16 December	Extended to Jurong Int.
		1982	24 May	Amended to ply West Coast Highway.
		1988	18 December	Integrated with Service 51 and discontinued.

Service 192 (since 1989)

Bus Service 192

Service 192A (1971 - 1974)

Operator	Route	Year	Date	Service changes
ABC	Clementi Rd ↔ South Canal (Apr - Sep 1971)	1971	11 April	Introduced between Clementi Rd Ter and Sth Canal Ter under 1971 Bus Reorganisation.
	Pasir Panjang Rd ↔ South Canal (Sep 1971 - 1974)		14 September	Amended to Pasir Panjang Rd Ter.
			28 September	Amended to ply the extended Ganges Ave towards Sth Canal Ter.
		1972	11 June	Amended to ply Upp Cross St with the partial conversion of Havelock Rd to one-way road, skipping Upp Hokien St.
		1974	3 February	Re-numbered Service 192 under 1974 Bus Rationalisation.

Service 193 (1971 - 1991)

Operator	Route	Year	Date	Service changes
ABC	Commonwealth Ave ↔ South Canal (Apr 1971)	1971	11 April	Introduced between Commonwealth Ave Ter and Sth Canal Ter under 1971 Bus Reorganisation.
	Commonwealth Ave ↺ Tg Pagar Rd (Apr - Nov 1971)		25 April	Integrated with Service 190 and extended to loop at Tg Pagar Rd from Commonwealth Ave Ter.
			28 September	Amended to ply the extended Ganges Ave towards Tg Pagar Rd.
	Bukit Timah ↺ Tg Pagar Rd (Nov 1971 - 1974)		4 November	Extended to Bt Timah 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.
	Bukit Timah ↔ Tg Pagar Rd (1974 - 1976)	1974	3 February	Amended to terminate at Tg Pagar Ter under 1974 Bus Rationalisation.
			8 December	Amended to ply Cecil St, skipping Robinson Rd.
	Upp Bt Timah Rd ↔ Tg Pagar Rd (1976 - 1979)	1976	TBC	Extended to Upp Bt Timah Rd Ter.
		1979	11 February	Amended to ply the extended Shenton Way, Rambau St and Trafalgar St towards Tg Pagar Ter, skipping Parsi Rd.
	Upp Bt Timah Rd ↔ Anson Rd (1979 - 1980)		1 August	Amended to Anson Rd Ter.
			11 November	Amended to ply Ganges Ave towards Upp Bt Timah Rd Ter with the realignment of Delta Circus.
			25 November	Amended to ply Pickering St and Church St, skipping Nth Canal Rd and Market St.
			30 December	Amended to ply Jln Anak Bt towards Anson Rd Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
	Princess Elizabeth ↔ Anson Rd (1980 - 1985)	1980	14 December	Amended to Princess Elizabeth Ter.
	Princess Elizabeth ↔ Prince Edward (1985 - 1987)	1985	27 January	Amended to Prince Edward Ter with the closure of Anson Rd Ter.
	Princess Elizabeth ↔ Shenton Way (1987 - 1991)	1987	28 June	Amended to Shenton Way Ter.
		1991	28 April	Discontinued under TransitLink Network Integration Exercise Phase 4.

Service 193 (since 1995)

Bus Service 193

Service 193A (1971 - 1974)

Operator	Route	Year	Date	Service changes
ABC	Commonwealth Ave ↔ South Canal (Apr 1971)	1971	18 April	Introduced between Commonwealth Ave Ter and Sth Canal Ter.
	Commonwealth Ave ↺ Tg Pagar Rd (Apr 1971 - 1974)		25 April	Integrated with Service 190 and extended to loop at Tg Pagar Rd from Commonwealth Ave 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.
		1974	3 February	Amended to Sth Canal Ter and re-numbered Service 189 under 1974 Bus Rationalisation.

Service 194 (1971 - 1993)

Operator	Year	Date	Service changes
ABC	1971	11 April	Introduced between Sth Canal Ter and Yong Siak St (Loop) under 1971 Bus Reorganisation.
	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.
	1976	28 March	Amended to ply Kim Pong Rd, skipping Seng Poh Rd and Lim Liak St.
	1987	6 April	Skips removed bus stop before College Rd along Outram Rd.
		1 November	Amended to ply Eu Tong Sen St to facilitate the second stage of road expansion along New Bridge Rd.
	1988	20 March	Amended to ply New Bridge Rd, skipping Sth Bridge Rd and Neil Rd.
	1993	4 April	Discontinued under TransitLink Network Integration Exercise Phase 12.

Service 194 (since 1995)

Bus Service 194

Service 195 / Short-Trip 195A / 195B (2002 - 2005) / 195B (2015 - 2018)

Bus Service 195

Service 196 / Short-Trip 196A

Bus Service 196

Service 197 (1971 - 1974)

Operator	Route	Year	Date	Service changes
ABC	Keppel Rd ↔ Jln Samulun (Apr - Nov 1971)	1971	11 April	Introduced between Keppel Rd Ter and Jln Samulun Ter under 1971 Bus Reorganisation.
	Crawford St ↔ Jln Samulun (Nov 1971 - 1974)		10 November	Extended to Crawford St Ter.
		1974	3 February	Discontinued under 1974 Bus Rationalization.

Service 197 (since 1978)

Bus Service 197

Service 198 / Short-Trip 198A

Bus Service 198

Service 199 (1971 - 1974)

Operator	Year	Date	Service changes
ABC	1971	21 July	Introduced between Prince Edward Ter and Dunearn Rd (Dunearn Hostel) (Loop).
	1973	11 March	Amended to ply Zion Rd and Hoot Kiam Rd towards Dunearn Rd with the partial conversion of Kim Seng Rd and Irwell Bank Rd to one-way traffic.
	1974	3 February	Discontinued under 1974 Bus Rationalization.

Service 199 (since 1978)

Bus Service 199

Service 200 / Short-Trip 200A

Bus Service 200

Service 201 (1971 - 1993)

Operator	Route	Year	Date	Service changes
UBC	Jln Jurong Kechil ↔ Pasir Panjang Rd (1971 - 1974)	1971	11 April	Introduced between Jln Jurong Kechil Ter and Pasir Panjang Rd Ter under 1971 Bus Reorganisation.
	Toh Tuck Rd ↔ Pasir Panjang Rd (1974 - 1981)	1974	3 February	Integrated with Service 207 and extended to Toh Tuck Rd End Ter under 1974 Bus Rationalisation.
		1979	30 December	Amended to ply Jln Anak Bt towards Pasir Panjang Rd Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
	Pasir Panjang Rd ↺ Jln Anak Bt (May - Jul 1981)	1981	25 May	Shortened to loop at Jln Anak Bt from Pasir Panjang Rd Ter with the introduction of Service 205.
	Kent Ridge ↺ Jln Anak Bt (Jul 1981 - 1993)		5 July	Amended to Kent Ridge Ter.
		1986	1 June	Skips removed bus stop before Ayer Rajah Rd along Clementi Rd.
		1987	19 April	Serves new staggered bus stop under the PIE Flyover along Jln Anak Bt, skipping the bus stop opposite Bt Timah Plaza.
				Amended to use new access road from Upp Bt Timah Rd to Jln Anak Bt, skipping BKE.
		1993	4 April	Discontinued with the introduction of Service 151 under TransitLink Network Integration Exercise Phase 12.

Service 201 (since 2014)

Bus Service 201