History of Services 191 - 201

Service 191 (1971 - 1983)

Operator	Year	Date	Service changes
STC	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.
		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.
	1981	15 June	Shortened to loop at Nth Bridge Rd with the introduction of Service 75, skipping Shenton Way.
		20 September	Extended to loop at Nicoll Highway.
	1983	30 October	Integrated with Service 7 and discontinued.

Service 191 (since 1988)

Operator	Year	Date	Service changes
	1988	29 May	Introduced between Ghim Moh Ter and Portsdown Rd (Loop), replacing the deleted sectors of Services 33 and 200.
	1994	16 January	Amended to Buona Vista Ter and converted to peak hour service on weekdays and Saturdays, skipping Ghim Moh Rd.
		1 February	Reverted to day service and extended to operate on Sundays and Public Holidays.
(Current)	2006	TBC	Serves merged bus stop opposite Buona Vista Stn along Nth Buona Vista Rd with the closure of the staggered bus stop.
	2015	6 December	Amended to ply Media Circle.
			Last bus extended to 2010 hrs daily.
	2017	21 August	Designated wheelchair-accessible bus service (WAB).

Service 191A (1971 - 1974)

Operator	Year	Date	Service changes
STC	1971	11 April	Introduced between Commonwealth Ave Ter and Prince Edward Ter under 1971 Bus Reorganisation.
ABS		6 December	Operations transferred to ABS.
	1974	3 February	Shortened to Jln Bt Merah Ter and 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	Year	Date	Service changes
	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.
		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)

Operator	Year	Date	Service changes
	1989	6 November	Introduced between Pioneer Rd Ter and Boon Lay Way (Loop) as a peak hour service on weekdays and Saturdays.
	1990	1 July	Amended to start from Boon Lay Int, amended to loop at Tuas Rd and converted to full day service.
		7 July	Amended to skip Tuas Rd End.
	1995	15 January	Amended to loop at Tuas Ave 1.
	1998	19 July	Extended to Tuas Ter and amended to ply Jurong West St 64, skipping Jln Boon Lay.
	1999	11 April	Amended to ply Pioneer Rd Nth with the realignment of Upp Jurong Rd.
			First bus from Boon Lay Int brought forward to 0545 hrs daily.
			First bus from Tuas Ter brought forward to 0630 hrs daily.
	2001	11 February	Integrated with Service 250 and amended to ply Pioneer Rd Nth, Lok Yang Way, Sixth Lok Yang Rd, Intl Rd, Benoi Rd and Jln Ahmad Ibrahim, skipping Upp Jurong Rd and PIE.
(Current)	2006	18 June	Amended to Boon Lay Temp Int.
	2008	15 June	Serves new pair of bus stops outside Blk 670A and outside Blk 678D along Jurong West St 64.
	2009	27 December	Amended to Boon Lay Integrated Transport Hub.
	2013	30 September	Designated wheelchair-accessible bus service (WAB).
	2015	28 November	Amended to ply Jurong West St 63 and Upp Jurong Rd, skipping Jurong West St 64, Jurong West Ave 4, Lok Yang Way, Sixth Lok Yang Rd and Intl Rd.
	2017	18 June	Amended to ply Jurong West St 62 and Pioneer Rd, skipping Jurong West St 63, Tuas Ave 7 and Tuas Lk 4, with the opening of Tuas West Extension (TWE).
		7 October	Amended to the new Tuas Ter.
	2022	13 February	Amended to ply new road towards Boon Lay Int, skipping the Tuas roundabout.

Service 192A (1971 - 1974)

Operator	Year	Date	Service changes
ABC	1971	11 April	Introduced between Clementi Rd Ter and Sth Canal Ter under 1971 Bus Reorganisation.
		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	Year	Date	Service changes
ABC	1971	11 April	Introduced between Commonwealth Ave Ter and Sth Canal Ter under 1971 Bus Reorganisation.
		25 April	Integrated with Service 190, extended to loop at Tg Pagar Rd.
		28 September	Amended to ply the extended Ganges Ave towards Tg Pagar Rd.
		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.
	1974	3 February	Amended to terminate at Tg Pagar Ter under 1974 Bus Rationalisation.
		8 December	Amended to ply Cecil St, skipping Robinson Rd.
	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.
		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.
	1980	14 December	Amended to Princess Elizabeth Ter.
	1985	27 January	Amended to Prince Edward Ter with the closure of Anson Rd Ter.
	1987	28 June	Amended to Shenton Way Ter.
	1991	28 April	Discontinued under TransitLink Network Integration Exercise Phase 4.

Service 193 (since 1995)

Operator	Year	Date	Service changes
	1995	15 January	Introduced between Boon Lay Int and Tuas West Dr (Loop).
	1997	TBC	Serves new pair of bus stops outside and opposite Sumitomo Warehouse along Tuas West Rd and 2 new bus stops opposite Asia Pacific Brewery and outside Raffles Country Club along Jln Ahmad Ibrahim.
	1998	19 July	Extended to Tuas Ter and amended to ply Jurong West St 64, skipping Jln Boon Lay.
	1999	11 April	Amended to ply Pioneer Rd Nth with the realignment of Upp Jurong Rd.
(Current)	2006	18 June	Amended to Boon Lay Temp Int.
	2008	15 June	Serves new pair of bus stops outside Blk 670A and outside Blk 678D along Jurong West St 64.
	2009	27 December	Amended to Boon Lay Integrated Transport Hub.
	2015	28 November	Amended to ply Pioneer Rd Nth, Lok Yang Way, Sixth Lok Yang Rd, Intl Rd, Benoi Rd and Jln Ahmad Ibrahim, skipping Upp Jurong Rd and PIE.
	2016	31 January	First bus from Boon Lay Int brought forward to 0545 hrs daily.
	2017	13 February	Designated wheelchair-accessible bus service (WAB).
		18 June	Serves new pair of bus stops outside Tuas West Rd Stn along Pioneer Rd.
		7 October	Amended to the new Tuas Ter.
	2022	13 February	Amended to ply new road towards Boon Lay Int, skipping the Tuas roundabout.

Service 193A (1971 - 1974)

Operator	Year	Date	Service changes
ABC	1971	18 April	Introduced between Commonwealth Ave Ter and Sth Canal Ter.
		25 April	Integrated with Service 190 and extended to loop at Tg Pagar Rd.
	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 abolished 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)

Operator	Year	Date	Service changes
	1995	15 January	Introduced between Boon Lay Int and Jln Ahmad Ibrahim (Jurong Bird Pk) (Loop).
(Current)	2006	18 June	Amended to Boon Lay Temp Int.
	2009	27 December	Amended to Boon Lay Integrated Transport Hub.
	2010	3 January	Serves the bus stops outside Blk 662D and opposite Blk 662C along Jurong West St 64, skipping the bus stops outside and opposite Boon Lay Stn along Boon Lay Way.
	2011	27 June	Designated wheelchair-accessible bus service (WAB).
	2015	12 December	Extended to loop at Pioneer Circus along Jln Ahmad Ibrahim.
			First bus brought forward to 0545 hrs daily. Last bus extended to 2345 hrs daily.

Service 195

Operator	Year	Date	Service changes
ABC	1971	11 April	Introduced between Crawford St Ter and Gagak Selari Barat (Loop) under 1971 Bus Reorganisation.
	1973	11 March	Amended to ply Zion Rd towards Crawford St Ter with the partial conversion of Kim Seng Rd to one-way traffic.
	1974	1 October	Serves new bus stop outside Nan Hwa Girls' High Sch along Bencoolen St.
	1975	2 February	Amended to ply Tiong Bahru Rd and the extended Zion Rd towards Crawford St Ter with the partial conversion of Kim Seng Rd and Outram Rd to one-way traffic.
	1978	15 January	Amended to ply Jln Sultan and Beach Rd, skipping Sumbawa Rd and Nth Bridge Rd.
	1979	28 October	Amended to ply Weld Rd and Jln Besar.
	1980	6 April	Amended to ply Nth Bridge Rd and Stamford Rd towards Lower Delta Rd, skipping Jln Sultan, Rochor Canal Rd and Bencoolen St.
	1988	18 December	Integrated with Services 55 and 203, amended to start from Sth Canal Ter and extended to loop at Commonwealth Dr.
	1990	10 June	Amended to ply New Bridge Rd, skipping Sth Bridge Rd.
	1993	4 April	Extended to Shenton Way Ter under TransitLink Network Integration Exercise Phase 12.
		5 December	Amended to Marina Ctr Ter under TransitLink Network Integration Exercise Phase 14.
	1999	10 July	Amended to ply Parliament Pl, St. Andrew's Rd and Beach Rd towards Marina Ctr Ter, skipping Hill St and Bras Basah Rd.
(Current)	2005	30 October	Serves new bus stop outside Blk 94 along Zion Rd.
	2007	24 June	Serves new bus stop outside Blk 114 along Depot Rd.
	2012	30 September	Designated wheelchair-accessible bus service (WAB).
	2014	27 April	Serves new bus stop outside Queens Condo along Commonwealth Ave.
	2021	27 February	Amended to the relocated Marina Ctr Ter.

Short Trip 195A

Operator	Year	Date	Service changes
(Current)	2002	TBC	Introduced from Alexandra Rd (Alexandra Hosp) to Tiong Bahru Rd (Tiong Bahru Plaza) during morning peak hours on weekdays and Saturdays.
	2005	TBC	Extended to start from Marina Ctr Ter and extended to operate during evening peak hours on weekdays and Saturdays.
	2007	24 June	Serves new bus stop outside Blk 114 along Depot Rd.
	2012	30 September	Designated wheelchair-accessible bus service (WAB).
	2014	27 April	Serves new bus stop outside Queens Condo along Commonwealth Ave.
	2021	27 February	Amended to the relocated Marina Ctr Ter.

Short Trip 195B (2002 - 2005)

Operator	Year	Date	Service changes
	2002	TBC	Introduced from Marina Ctr Ter to Commonwealth Dr (Opp Blk 115B) during evening peak hours on weekdays.
	2005	TBC	Discontinued.

Short Trip 195B (2015 - 2018)

Operator	Year	Date	Service changes
	2015	20 June	Introduced as a full day short-trip service from Marina Ctr Ter to Commonwealth Dr (Opp Blk 115B). Wheelchair-accessible at launch.
		24 August	Extended to terminate at Commonwealth Ave (Commonwealth Stn).
	2018	28 October	Discontinued.

Service 196

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Gagak Selari Barat Ter and Jln Samulun Ter under 1971 Bus Reorganisation.
	1974	3 February	Extended to Prince Edward Ter under 1974 Bus Rationalisation.
	1976	9 May	Amended to ply Jurong Pier Rd in both directions.
	1977	17 May	Amended to ply Commonwealth Ave Extension and Nth Buona Vista Rd towards Jln Samulun Ter.
	1978	1 June	Amended to Jurong Int.
	1979	11 February	Amended to ply the extended Shenton Way towards Jurong Int, 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.
	1984	16 September	Integrated with Service 15 and extended to Marine Parade Ter.
	1986	1 June	Skips abolished bus stop before Ayer Rajah Rd along Clementi Rd.
	1987	1 November	Amended to ply Eu Tong Sen St towards Marine Parade Ter to facilitate the second stage of road expansion along New Bridge Rd.
	1988	6 June	First bus from Marine Parade Ter brought forward to 0545 hrs daily.
			Last bus from Jurong Int revised to 2345 hrs daily.
	1990	1 July	Amended to Boon Lay Int.
	1991	3 November	Serves additional bus stop after Jln Bt Merah along Kg Bahru Rd.
	1992	28 June	Shortened to Buona Vista Ter under TransitLink Network Integration Exercise Phase 8.
		15 November	Extended to Clementi Int.
	1994	29 May	Serves 2 new pairs of bus stops outside The Concourse, outside Golden Mile Twr and outside and opposite Suntec City along Nicoll Highway.
	2001	15 April	Amended to ply Esplanade Dr, skipping Connaught Dr/Empress Pl.
		16 September	Extended to Bedok Int with the closure of Marine Parade Ter.
(Current)	2002	TBC	Serves additional bus stop before Hosp Dr along Eu Tong Sen St.
	2004	20 April	Amended to ply Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd to facilitate reinstatement works for the collapsed Nicoll Highway.
		6 December	Amended to ply the reinstated Nicoll Highway, skipping Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd.
	2005	2 July	Serves the bus stop outside Fullerton Sq along Fullerton Rd and an additional bus stop opposite AIA Twr along Robinson Rd with the abolition of the bus stop outside Clifford Ctr along Collyer Quay.
	2006	TBC	Serves merged bus stop opposite Buona Vista Stn along Nth Buona Vista Rd with the closure of the staggered bus stop.
		TBC	Serves additional bus stop outside Victoria Sch along Marine Parade Rd.
		29 October	Amended to Clementi Temp Int.
		3 December	Designated wheelchair-accessible bus service (WAB).
	2011	19 November	Amended to Bedok Temp Int.
		26 November	Amended to Clementi Integrated Transport Hub.
	2014	10 August	Serves new bus stop opposite Blk 2 along Mountbatten Rd.
		30 November	Amended to Bedok Integrated Transport Hub.
	2017	26 November	Skips abolished bus stop before Hosp Dr along Kg Bahru Rd.
	2024	28 January	Serves relocated bus stop after Clementi Swim Cplx along AYE.

Short Trip 196A

Operator	Year	Date	Service changes
(Current)	2005	17 October	Introduced from Mountbatten Rd (Aft Tg Katong Rd) to Shenton Way (Opp MAS Bldg) during morning peak hours on weekdays.
	2006	3 December	Designated wheelchair-accessible bus service (WAB).
	2007	TBC	Extended to start from Marine Parade Rd (Lagoon View).
		TBC	Serves additional bus stop outside Victoria Sch along Marine Parade Rd.
	2009	3 August	Extended to start from Bedok Int.
	2011	19 November	Amended to Bedok Temp Int.
	2014	10 August	Serves new bus stop opposite Blk 2 along Mountbatten Rd.
		30 November	Amended to Bedok Integrated Transport Hub.

Service 197 (1971 - 1974)

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

Service 197 (since 1978)

Operator	Year	Date	Service changes
	1978	1 June	Introduced between Jurong Int and Geylang Fringe Car Pk.
	1986	7 September	Last bus from Jurong Int extended to 0025 hrs on Saturdays, Sundays and Public Holidays.
	1987	27 September	Amended to ply the extended Eu Tong Sen St towards Lor 1 Geylang Ter to facilitate the first stage of road expansion along New Bridge Rd.
		1 November	Amended to ply Eu Tong Sen St towards Lor 1 Geylang Ter to facilitate the second stage of road expansion along New Bridge Rd.
	1988	11 January	Serves merged bus stop along Ayer Rajah Rd.
	1989	29 January	Serves relocated bus stop opposite Sri Mariamman Tp along Sth Bridge Rd, skipping abolished bus stop opposite Jamae Mque.
	1990	1 July	Amended to Boon Lay Int.
		22 July	Serves the bus stop outside Ellenborough Mkt along Eu Tong Sen St, skipping the bus stop outside Hill St Bldg along Hill St.
	1991	7 April	Integrated with Service 41 and extended to Bedok Int under TransitLink Network Integration Exercise Phase 3.
	1992	28 June	Shortened to Jurong East Int under TransitLink Network Integration Exercise Phase 8 with the route extension of Service 198 to Boon Lay Int.
	2000	TBC	Serves additional bus stop after Jln Bt Merah along Kg Bahru Rd.
(Current)	2003	TBC	Serves new bus stop outside Shell Kiosk along Tg Katong Rd.
		7 December	Serves the bus stop outside Blk 3 along Neil Rd with the abolition of the bus stop outside Everton Pk.
	2005	5 June	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
		12 June	Serves new bus stop outside Science Pk along AYE.
		2 July	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.
	2006	TBC	Serves additional bus stop outside Victoria Sch along Marine Parade Rd.
	2009	5 July	Amended to ply Boon Lay Way and Jurong East Ctrl with the closure of Jurong East St 12 to facilitate the Jurong East Modification Project (JEMP).
	2011	26 June	Serves new bus stop outside The Pinnacle @ Duxton along Neil Rd.
		19 November	Amended to Bedok Temp Int.
		17 December	Amended to Jurong East Temp Int.
	2012	25 June	Designated wheelchair-accessible bus service (WAB).
	2014	30 November	Amended to Bedok Integrated Transport Hub.
	2017	26 November	Serves the bus stop after Hosp Dr along Eu Tong Sen St, skipping abolished bus stop before Hosp Dr along Kg Bahru Rd.
	2020	6 December	Amended to relocated Jurong East Temp Int and amended to ply Jurong East St 12, skipping Jurong Town Hall Rd, Jurong East Ctrl and Jurong Gateway Rd.
	2024	28 January	Serves relocated bus stop after Clementi Swim Cplx along AYE.

Service 198

Operator	Year	Date	Service changes
ABC	1971	11 April	Introduced between New Market Rd Ter and Jln Boon Lay Ter under 1971 Bus Reorganisation.
		6 June	Amended to Sth Canal Ter.
		28 September	Amended to ply the extended Ganges Ave towards Sth Canal 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	Extended to Jln Kolam Ayer Ter under 1974 Bus Rationalisation.
		1 October	Serves new bus stop outside Nan Hwa Girls' High Sch along Bencoolen St.
			Serves merged bus stop outside Sri Srinivasa Perumal Tp along Serangoon Rd.
	1976	13 December	Extended to Sims Pl Ter.
	1977	17 May	Amended to ply Commonwealth Ave Extension and Nth Buona Vista Rd towards Jln Boon Lay Ter.
	1978	1 June	Extended to Jurong Int.
	1979	11 November	Amended to ply Ganges Ave towards Jurong Int with the realignment of Delta Circus.
	1982	22 May	Amended to ply Aljunied Rd and MacPherson Rd, skipping Jln Kolam Ayer.
	1988	29 May	Skips the bus stop outside NUH along AYE.
	1990	1 July	Amended to Boon Lay Int.
	1991	7 April	Shortened to Jurong East Int under TransitLink Network Integration Exercise Phase 3.
	1992	28 June	Extended to Boon Lay Int and shortened to Bt Merah Int under TransitLink Network Integration Exercise Phase 8 with the route amendment of Service 64 to Sims Pl Ter.
	1996	TBC	Serves new bus stop outside Blk 220 along Boon Lay Ave.
(Current)	2006	18 June	Amended to Boon Lay Temp Int.
		3 December	Designated wheelchair-accessible bus service (WAB).
	2009	27 December	Amended to Boon Lay Integrated Transport Hub.
	2024	28 January	Serves relocated bus stop after Clementi Swim Cplx along AYE.

Short Trip 198A

Operator	Year	Date	Service changes
(Current)	2012	6 February	Introduced from Boon Lay Int to Jurong East Ave 1 (Opp Parc Oasis) during evening peak hours on weekdays. Wheelchair-accessible at launch.
	2018	18 November	Enhanced to operate during the evening on Saturdays, Sundays and Public Holidays.

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)

Operator	Year	Date	Service changes
	1978	3 July	Introduced between Jurong Int and Nanyang Ave (Loop), operating on weekdays and Saturdays only.
	1979	1 October	Amended to ply Corporation Rd, Jurong Rd and Upp Jurong Rd.
		12 November	Amended to ply Boon Lay Way and Jln Boon Lay.
	1982	23 August	Amended to serve NTI via Nanyang Cres and Nanyang Circle between 0600 hrs and 1800 hrs on weekdays & Saturdays.
	1985	30 November	Amended to ply along the new carriageway of Upp Jurong Rd (between Jln Boon Lay and Benoi Rd).
	1986	24 March	Amended to ply Jln Bahar, skipping Upp Jurong Rd.
		2 June	Extended to operate on Sundays and Public Holidays.
			Last bus extended to 2200 hrs on weekdays and Saturdays.
	1987	22 February	Amended to ply Nanyang Ave, Nanyang Cres and Nanyang Dr.
	1989	22 October	Integrated with Service 406 and amended to ply Yung Ho Rd, Yuan Ching Rd and Boon Lay Way.
	1990	3 June	Amended to ply Nanyang Circle and Student Wk, skipping Nanyang Ave.
		1 July	Amended to Boon Lay Int.
		19 November	First bus revised to 0630 hrs on Sundays and Public Holidays.
	1991	20 January	Amended to ply Nanyang Dr, skipping Nanyang Cres.
	1999	TBC	Last bus extended to 0025 hrs on Sundays and Public Holidays.
	2001	7 January	Amended to loop at Nanyang Cres with the introduction of Service 179.
			Last bus revised to 0020 hrs on Sundays and Public Holidays.
(Current)	2006	18 June	Amended to Boon Lay Temp Int.
	2008	2 December	Designated wheelchair-accessible bus service (WAB).
	2009	27 December	Amended to ply Jurong West Ctrl 1, skipping Jurong West Ctrl 3.
	2010	10 February	Serves additional bus stop outside Blk 263 along Jln Boon Lay.
		8 May	Amended to Boon Lay Integrated Transport Hub.
	2016	13 November	Serves additional bus stop opposite Nanyang Ave along Jln Bahar.
	2017	23 July	Serves new bus stop outside Nanyang Cres Halls along Nanyang Cres.

Service 200

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Bt Timah Ter and Sth Buona Vista Rd Ter under 1971 Bus Reorganisation.
		TBC	Extended to Upp Bt Timah Rd Ter.
	1974	3 February	Extended to Pasir Panjang Rd Ter under 1974 Bus Rationalisation.
	1977	17 May	Amended to ply Commonwealth Ave Extension and Nth Buona Vista Rd towards Pasir Panjang Rd Ter.
	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.
	1981	5 July	Amended to Kent Ridge Ter.
		15 November	Shortened to loop at Jln Anak Bt from Kent Ridge Ter.
	1987	12 August	Serves new bus stop opposite PSB Science Pk Bldg along South Buona Vista Rd.
	1988	29 May	Amended to ply Buona Vista Flyover with the opening of AYE, skipping Portsdown Rd.
	1989	25 June	Skips the bus stop after Tan Boon Chong Ave along Holland Rd.
	1993	5 December	Shortened to loop at Holland Dr under TransitLink Network Integration Exercise Phase 14.
(Current)	2006	17 December	Amended to start from Buona Vista Ter and loop at Kent Ridge Ter.
	2015	22 June	Designated wheelchair-accessible bus service (WAB).

Short Trip 200A

Operator	Year	Date	Service changes
(Current)	2012	17 September	Introduced from Buona Vista Ter to Kent Ridge Ter during morning peak hours on weekdays and after the last bus of Service 200 daily.
	2015	22 June	Designated wheelchair-accessible bus service (WAB).

Service 201 (1971 - 1993)

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Jln Jurong Kechil Ter and Clementi Rd Ter under 1971 Bus Reorganisation.
	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 Clementi Rd Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
	1981	25 May	Shortened to loop at Jln Anak Bt from Pasir Panjang Rd Ter.
		5 July	Amended to Kent Ridge Ter.
	1986	1 June	Skips abolished 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)

Operator	Year	Date	Service changes
(Current)	2014	23 November	Introduced between Kent Ridge Ter and Teban Gdns Rd (Loop) under the LTA's Bus Service Enhancement Programme (BSEP), operating between 0545 hrs and 2330 hrs daily.
	2015	30 March	Designated wheelchair-accessible bus service (WAB).
	2023	8 January	Amended to ply realigned Teban Gdns Rd with the permanent partial closure of Teban Gdns Rd to facilitate the construction of Pandan Reservoir MRT station on the Jurong Region MRT Line.