History of Services 1 - 10

Service 1

Date	Service changes
11 April 1971	Introduced between Changi Point and Delta Circus.
1 December 1974	Amended to ply New Changi Rd, Bedok Plain, Bedok Heights, Upp East Coast Rd and Bedok Rd.
14 November 1975	Amended to ply New Changi Rd (now known as New Upp Changi Rd).
11 November 1979	Amended to Delta Fringe Car Park.
1983	Amended to Changi Village Ter.
5 November 1989	Withdrawn under Bus-MRT Rationalisation.

Service 1A

Date	Service changes
1 August 1971	Introduced between Changi Point and Delta Circus, via Nicoll Dr and North Bridge Rd.
3 February 1974	Re-numbered Service 3 under 1974 Bus Rationalisation. (Related change)

Service 2

Date	Service changes
11 April 1971	Introduced between Changi Point and Commonwealth Ave/North Buona Vista Rd.
1 December 1974	Amended to ply New Changi Rd, Bedok Plain, Bedok Heights, Upp East Coast Rd and Bedok Rd.
14 November 1975	Amended to ply New Changi Rd (now known as New Upp Changi Rd).
28 December 1980	Amended to ply Jln Bt Merah and Kg Bahru Rd in both directions, skipping Outram Rd, Tiong Bahru Rd, Henderson Rd.
1983	Amended to Changi Village Ter. At the same time, amended to Buona Vista Ter.
29 November 1992	Shortened to New Bridge Rd Ter under TransitLink Integration Exercise.
11 April 1993	Amended to ply Jln Sultan, Victoria St, Hill St, New Bridge Rd & Eu Tong Sen St, skipping North Bridge Rd, South Bridge Rd, Neil Rd & Eu Tong Sen St.
3 July 1994	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, North Bridge Rd and Jln Sultan.
1997	Amended to ply Upp Pickering St, South Bridge Rd and Kreta Ayer Rd with the partial closure of New Bridge Rd to facilitate the construction works for the North-East MRT Line.
2002	Amended back to ply the reinstated New Bridge Rd, skipping Upp Pickering St, South Bridge Rd and Kreta Ayer Rd.
29 December 2013	Amended to ply Upp Changi Link, with the permanent closure of part of Upp Changi Rd.

Service 2A

Date	Service changes
1 August 1971	Introduced between Changi Point and Commonwealth Ave/North Buona Vista Rd, via New Changi Rd and Shenton Way.
3 February 1974	Re-numbered Service 3 under 1974 Bus Rationalisation.

Service 3

Service Gen	Date	Service changes
1st Gen (1974 - 1991)	3 February 1974	Re-numbered from Service 1A as a service between Changi Point and Delta Circus. (Related change)
	1 December 1974	Amended to ply New Changi Rd, Bedok Plain, Bedok Heights, Upp East Coast Rd and Bedok Rd.
	30 November 1975	Amended to ply Bedok Plain and Bedok Walk (now known as Bedok South Rd and Bedok South Ave 3 respectively).
	15 July 1976	Amended to ply Upp Changi Rd, skipping Telok Paku Rd and Nicoll Dr.
	27 February 1977	Shortened to Bedok South Rd Ter.
	8 April 1979	Amended to Bedok Int. At the same time, shortened to loop at New Bridge Rd and converted to a semi-express service. The express sector was along Geylang Rd, Guillemard Rd, Nicoll Highway, Connaught Dr and Stamford Rd towards New Bridge Rd; Victoria St, Bras Basah Rd, Nicoll Highway, Guillemard Rd, Lor 22 Geylang, Aljunied Rd and Sims Ave towards Bedok.
	27 November 1983	Express sector shortened to Changi Rd (after Still Rd) and Geylang Rd (before Mountbatten Rd) and proceed via Kallang Rd, Crawford St, North Bridge Rd, South Bridge Rd, Neil Rd and New Bridge Rd. Return trip via New Bridge Rd, Hill St, Victoria St, Kallang Rd followed by express sector along Sims Ave between Geylang Lor 1 and Jln Eunos. At the same time, merged with Service 6.
	12 January 1986	Converted to trunk service.
	26 January 1987	Extended to Jurong East Int via Jln Bt Merah, Queensway, Commonwealth Ave, Commonwealth Ave West, Boon Lay Way and Jurong East Ctrl.
	20 March 1988	Amended to ply Upp Cross St and New Bridge Rd, skipping part of South Bridge Rd.
	6 January 1991	Withdrawn under TransitLink Integration Exercise.
2nd Gen (2002 - present)	7 April 2002	Re-introduced between Tampines and Pasir Ris St 71 (loop), with the merger of Feeder Service 294 and Townlink Service 357.
	19 October 2003	Extended to loop at Punggol Ctrl.
	30 November 2003	Amended to Punggol Temp Int.
	24 August 2014	Amended to call at the bus stops near Punggol Flyover along the TPE.

Service 4

Service Gen	Date	Service changes
1st Gen (1971 - 1974)	11 April 1971	Introduced between Changi Point and Lloyd Leas Estate (loop).
	3 February 1974	Withdrawn under 1974 Bus Rationalisation.
2nd Gen (1979 - 1993)	11 March 1979	Re-introduced between Bedok and Moulmein Rd (loop).
	31 July 1988	Extended to St. Michael's Ter via Moulmein Rd, Thomson Rd, Balestier Rd, Whampoa Dr/Kim Keat Rd and Jln Bahagia.
	10 March 1990	Merged with Service 19 and extended to Pasir Ris Int under Bus-MRT Rationalisation.
	29 November 1992	Shortened to Tampines Int under TransitLink Integration Exercise.
	23 May 1993	Merged with Services 21 & 67 and withdrawn under TransitLink Integration Exercise.
3rd Gen (2013 - present)	17 March 2013	Re-introduced between Tampines and Changi North Way (loop) via Flora Rd/Mariam Way under the LTA's Bus Service Enhancement Programme (BSEP).

Service 5

Service Gen	Date	Service changes
1st Gen (1971 - 1995)	11 April 1971	Introduced between Upp Changi Rd and Commonwealth Ave/North Buona Vista Rd.
	1973	Extended to terminate at Upp Bt Timah Ter.
	3 February 1974	Shortened to Chai Chee Ter.
	1977	Shortened to Lor 1 Geylang Ter.
	1 June 1986	Extended to Zhenghua Ter.
	11 October 1987	Amended to Bt Panjang Ter.
	29 March 1992	Amended to ply Holland Ave, C'wealth Ave, Margaret Dr, Alexandra Rd, Lower Delta Rd, Jln Bt Merah, Kg Bahru Rd and Eu Tong Sen St/New Bridge Rd under TransitLink Integration Exercise, skipping Queensway, C'wealth Ave, Alexandra Rd, Ganges Ave and Havelock Rd.
	11 April 1993	Amended to ply Jln Sultan, Victoria St, Hill St and New Bridge Rd, skipping North Bridge Rd, South Bridge Rd and Upp Cross St.
	3 July 1994	Amended to ply Kallang Rd and Victoria St (towards Bt Panjang Ter), skipping Crawford St, North Bridge Rd and Jln Sultan.
	17 September 1995	Handed over to TIBS. (Related change)
2nd Gen (2007 - present)	11 March 2007	Re-introduced between Pasir Ris and Bukit Merah.
	28 August 2011	Amended to ply Jln Tenaga & Jln Damai with the partial closure of Kaki Bukit Ave 1 to facilitate the Downtown MRT Line construction works.

Service 6

Service Gen	Date	Service changes
1st Gen (1977 - 1983)	11 July 1977	Introduced as a semi-express service between Chai Chee and New Bridge Rd (loop).
	25 February 1979	Amended to Bedok Int.
	27 November 1983	Merged with Service 3 and withdrawn.
2nd Gen (1993 - present)	25 October 1993	Re-introduced as a peak hour service between Pasir Ris and Loyang Cres (loop).
	24 October 1994	Converted to full day service.
	20 December 2004	Amended to ply Loyang Way and Loyang Ave towards Pasir Ris.

Service 7

Date	Service changes
11 March 1979	Introduced as a semi-express service between Bedok Int and Holland Rd Fringe Car Park (Dempsey Rd) (loop), replacing Blue Arrow Service 307.
1982	Extended to Clementi Int.
6 January 1985	Extended to Jurong East Ctrl Ter.
30 June 1985	Amended to Jurong East Int.
29 August 1985	Converted to trunk service.
5 November 1989	Amended to ply Mountbatten Rd, Geylang Rd, Kallang Rd, Crawford St and North Bridge Rd (towards Clementi) and Victoria St, Kallang Rd, Lor 1 Geylang and Mountbatten Rd (towards Bedok) under Bus-MRT Rationalisation, skipping Nicoll Highway.
7 April 1991	Shortened to Clementi Int under TransitLink Integration Exercise. At the same time, amended to Clementi Ave 5, skipping Commonwealth Ave West and Clementi Ave 2.
28 April 1991	Amended to ply Clementi Ave 5 in both directions.
5 June 2005	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
2 July 2005	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd. At the same time, amended to ply Grange Rd with the closure of Orchard Link.
29 October 2006	Amended to Clementi Temp Int.
19 November 2011	Amended to Bedok Temp Int.
26 November 2011	Amended to air-conditioned Clementi Int.
30 November 2014	Amended to air-conditioned Bedok Int.

Service 8

Service Gen	Date	Service changes
1st Gen (1979 - 1989)	26 February 1979	Introduced as a semi-express service between Bedok and Shenton Way (loop).
	30 November 1986	Extended to Marina Ctr Ter.
	6 November 1989	Withdrawn under Bus-MRT Rationalisation.
2nd Gen (1990 - present)	1 March 1990	Re-introduced as an air-conditioned service between Pasir Ris and Toa Payoh.
	29 November 1992	Shortened to Tampines Int under TransitLink Integration Exercise.
	5 March 1994	Amended to use Kim Keat Flyover with the closure of Toa Payoh South Flyover.
	18 September 1995	Amended to ply Tampines Ave 1, Tampines Ave 10 (express) and Bedok North Rd with the opening of Temasek Polytechnic.
	31 May 1998	Amended to Toa Payoh Temp Int.
	19 May 2002	Amended to air-conditioned Toa Payoh Int.
	4 September 2011	Amended to skip Bendemeer Rd, Whampoa North and Serangoon Rd.

Service 9

Date	Service changes
8 April 1979	Introduced between Lor 1 Geylang and Changi Point.
25 June 1983	Merged with Service 391 and 395 and extended to loop at Changi Airport Cargo Complex under Changi Airport Bus Plan 1983.
15 December 1985	Amended to ply Loyang Ave, skipping part of Upp Changi Rd and Loyang Way.
10 April 1988	Amended to ply Upp Changi Rd East, Simei Rd, Tampines St 31, Ave 2 & Ave 7, skipping Bedok Rd & Upp Changi Rd in both directions.
29 November 1992	Shortened to Bedok Int under TransitLink Integration Exercise.
15 January 1995	Amended to ply Bedok Rd, Upp Changi Rd, Simei Ave, Simei St 3, Simei Rd, skipping Upp Changi Rd East and Simei Rd.
19 November 2011	Amended to Bedok Temp Int.
30 November 2014	Amended to air-conditioned Bedok Int.

Service 10

Date	Service changes
11 April 1971	Introduced between Bedok Rd and Prince Edward Rd.
16 June 1971	Extended to Shipyard Rd Ter.
1975	Amended to Upp Changi Rd 8¼ ms (13.3km) Ter.
1 June 1978	Amended to Jurong Int.
1979	Relocated to Upp Changi Rd 15.5km.
15 June 1980	Amended to Somapah Ter.
27 April 1984	Extended to Tampines Ave 5 Ter.
29 November 1987	Amended to Tampines Int.
1 July 1990	Shortened to Clementi Int.
28 June 1992	Amended to Tg Katong Rd, Dunman Rd, Old Airport Rd, skipping part of Mountbatten Rd.
7 March 1999	Shortened to Kent Ridge Ter with the introduction of Service 188.
2000	Amended to ply Esplanade Dr, skipping Connaught Dr.
19 March 2006	Amended to ply Cassia Link, Cassia Cres, Guillemard Rd and Guillemard Camp Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction works for the Circle MRT Line.
29 December 2008	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Cassia Link, Guillemard Rd and Guillemard Camp Rd.

Service 11

Service Gen	Date	Service changes
1st Gen (1971 - 1988)	11 April 1971	Introduced between Bedok Rd and Tg Pagar Rd/Anson Rd.
	3 February 1974	Amended to Upp Changi Rd 8¼ ms (13.3km) Ter under 1974 Bus Rationalisation.
	23 October 1977	Amended to New Bridge Rd Ter.
	1979	Relocated to Upp Changi Rd 15.5km.
	15 June 1980	Amended to Somapah Ter.
	6 June 1987	Amended to the relocated New Bridge Rd Ter.
	23 October 1988	Withdrawn under Bus-MRT Rationalisation.
2nd Gen (1990 - present)	14 April 1990	Introduced between Lor 1 Geylang and Kallang Park/National Stadium (loop).
	12 June 1994	Amended to ply Nicoll Highway and Stadium Rd before plying Stadium Blvd.
	2002	Amended to ply Stadium Rd, Stadium Walk and Stadium Blvd.
	5 June 2005	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
	2 July 2005	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.
	18 February 2006	Amended to ply Stadium Cres with the closure of Stadium Blvd to facilitate the construction works for the Circle MRT Line.
	29 September 2010	Amended to ply Mountbatten Rd and Stadium Blvd with the closure of Stadium Rd.
	8 June 2014	Extended to loop at Rhu Cross via Stadium Way and Tg Rhu Rd under the LTA's Bus Service Enhancement Programme (BSEP).

Service 12

Date	Service changes
11 April 1971	Introduced between Bedok Rd and Commonwealth Ave/North Buona Vista Rd.
3 February 1974	Amended to Upp Changi Rd 8¼ ms (13.3km) Ter under 1974 Bus Rationalisation.
1979	Relocated to Upp Changi Rd 15.5km.
15 June 1980	Amended to Somapah Ter.
28 December 1980	Amended to ply Upp Changi Rd.
1983	Amended to Buona Vista Ter.
23 October 1988	Extended to Pasir Ris Ter via Simei Rd, Tampines St 31/Ave 2/Ave 7, Loyang Ave & Pasir Ris Dr 1/Dr 6/Dr 3. At the same time, amended to New Bridge Rd Ter via South Bridge Rd, Upp Cross St and Eu Tong Sen St/New Bridge Rd under Bus-MRT Rationalisation.
10 December 1989	Amended to Pasir Ris Int.
11 April 1993	Amended to ply Jln Sultan, Victoria St, Hill St and New Bridge Rd, skipping North Bridge Rd, South Bridge Rd and Upp Cross St.
3 July 1994	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, North Bridge Rd and Jln Sultan.
1997	Amended to ply Upp Pickering St, South Bridge Rd and Kreta Ayer Rd with the partial closure of New Bridge Rd to facilitate the construction works for the North East MRT Line.
2002	Amended back to ply the reinstated New Bridge Rd, skipping Upp Pickering St, South Bridge Rd and Kreta Ayer Rd.
5 June 2005	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
2 July 2005	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.

Service 12A

Date	Service changes
31 December 1979	Introduced between Bedok South Ave 3 and North Bridge Rd (loop), an alternate variant of Service 12.
2 September 1984	Withdrawn.

Service 13

Date	Service changes
11 April 1971	Introduced between Bedok Rd/Upp Changi Rd and Commonwealth Ave/North Buona Vista Rd.
9 May 1971	Amended to ply Upp Changi Rd, Changi Rd, Geylang Rd, Kallang Rd, Crawford St, North Bridge Rd and Stamford Rd.
3 February 1974	Amended to Upp Changi Rd 8¼ ms (13.3km) Ter under 1974 Bus Rationalisation.
22 February 1974	Amended to Orchard Blvd and Grange Rd, skipping Orchard Rd and Tanglin Rd, with the conversion of Orchard Rd to one-way road.
1 December 1974	Amended to Upp Changi Rd Ter (near Track 6).
16 November 1975	Amended to Chai Chee Ter via New Upp Changi Rd.
7 March 1977	Extended to Ghim Moh Ter.
8 September 1985	Extended to Bedok Int with the closure of Chai Chee Ter.
12 April 1987	Shortened to Eunos Ter.
5 November 1989	Extended to Yio Chu Kang Ter via Lavender St, Serangoon Rd/Bendemeer Rd, Upp Serangoon Rd, Braddell Rd, Bishan Rd & Ang Mo Kio Ave 8/Ave 3/Ave 6 under Bus-MRT Rationalisation. Deleted sectors between Orchard and Ghim Moh Ter were covered by Service 111.
10 December 1989	Amended to Eunos Int.
2 September 1990	Amended to ply Bishan St 22, Marymount Rd & Ang Mo Kio Ave 6 under TransitLink Integration Exercise, skipping part of Bishan Rd, Ang Mo Kio Ave 8 & Ave 3.
1998	Extended to Marine Parade Ter with the route amendment of Service 15, via Marine Cres & Marine Terr.
16 September 2001	Amended to loop at Siglap Link with the closure of Marine Parade Ter.
9 December 2001	Extended to Upp East Coast Ter.
4 August 2002	Allowed boarding and alighting activities at Upp East Coast Ter.

Service 13A

Date	Service changes
11 April 1971	Introduced between Bedok Rd/Upp Changi Rd and Commonwealth Ave/North Buona Vista Rd.
3 February 1974	Re-numbered Service 14 under 1974 Bus Rationalisation. At the same time, shortened to loop at Mei Chin Rd. (Related change)

Service 14

Date	Service changes
3 February 1974	Re-numbered from Service 13A as a service between Bedok Rd and Mei Chin Rd (loop). (Related change)
1976	Amended to Upp Changi Rd 8¼ ms (13.3 km) Ter.
2 December 1979	Extended to Jln Bt Merah Ter via Napier Rd, Holland Rd, Queensway, Jln Bt Merah, Henderson Rd & Bt Merah Ctrl. At the same time, skipped Mei Chin Rd.
1979	Relocated to Upp Changi Rd 15.5km.
15 June 1980	Amended to Somapah Ter.
28 September 1980	Amended to Bt Merah Int.
16 March 1986	Amended to ply Kallang Park/National Stadium.
13 April 1986	Amended to ply Stadium Rd, skipping Stadium Walk.
5 November 1989	Extended to Changi Village Ter under Bus-MRT Rationalisation.
20 January 1991	Shortened to Bedok Int under TransitLink Integration Exercise.
29 March 1992	Amended to skip Henderson Rd under TransitLink Integration Exercise.
23 May 1993	Merged with Service 92 and extended to Clementi Int under TransitLink Integration Exercise, skipping National Stadium, Tanglin Rd/Orchard Blvd, Napier Rd, Holland Rd & Queensway. Deleted sectors were covered by Service 123.
2 July 2005	Amended to ply Grange Rd with the closure of Orchard Link.
29 October 2006	Amended to Clementi Temp Int.
19 November 2011	Amended to Bedok Temp Int.
26 November 2011	Amended to air-conditioned Clementi Int.
30 November 2014	Amended to air-conditioned Bedok Int.

Service 15

Service Gen	Date	Service changes
1st Gen (1975 - 1984)	22 June 1975	Introduced between Marine Terr and Prince Edward.
	4 June 1976	Extended to loop at Shenton Way.
	1981	Amended to Marine Parade Ter.
	16 September 1984	Merged with Service 196 and withdrawn.
2nd Gen (1995 - present)	18th September 1995	Re-introduced between Pasir Ris and Eunos with the opening of Temasek Polytechnic.
	1997	Merged with Service M4 and extended to loop at Marine Parade Rd.
	1998	Amended to skip Marine Cres with the route extension of Service 13.
	28 August 2011	Amended to ply Jln Tenaga & Jln Damai, with the partial closure of Kaki Bukit Ave 1 to facilitate the Downtown MRT Line construction works.

Service 16

Date	Service changes
2 May 1976	Introduced between Marine Terr and Telok Blangah Heights.
28 September 1980	Amended to Bt Merah Int.
1981	Amended to Marine Parade Ter.
1983	Amended to ply Kallang Park/National Stadium after 1930 hours daily.
13 April 1986	Amended to ply Stadium Rd, skipping Stadium Walk during the evening diversion into Kallang Park/National Stadium.
23 February 1987	Amended to Kallang Park/National Stadium after 1845 hours daily.
1993	Amended to ply Kallang Park/National Stadium permanently.
5 December 1993	Merged with Service 149 and extended to Changi Airport under TransitLink Integration Exercise. At the same time, amended to ply Zion Rd/Kim Seng Rd, Outram Rd and Tiong Bahru Rd, skipping River Valley Rd, Delta Rd and Lower Delta Rd.
6 September 1998	Shortened back to Marine Parade Ter with the conversion of Service 36 to a full-day trunk service.
16 September 2001	Amended to loop at Siglap Link with the closure of Marine Parade Ter.
Feb 2002	Amended to ply Stadium Walk/Cres with the construction of Circle Line.
2 July 2005	Amended to ply Grange Rd with the closure of Orchard Link.
18 February 2006	Amended to ply Stadium Cres with the closure of Stadium Blvd to facilitate the construction of Circle Line.
19 March 2006	Amended to ply Cassia Link, Cassia Cres, Guillemard Rd and Guillemard Camp Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction works for the Circle MRT Line.
19 August 2007	Extended to Bedok Int via Upp East Coast Rd, Bedok South Ave 1, Bedok South Rd & Bedok North Ave 1.
29 December 2008	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Cassia Link, Guillemard Rd and Guillemard Camp Rd.
29 September 2010	Amended to ply Mountbatten Rd with the closure of Stadium Rd/Stadium Dr to facilitate the construction of the Singapore Sports Hub.
19 November 2011	Amended to Bedok Temp Int.
30 November 2014	Amended to air-conditioned Bedok Int.

Service 16E

Date	Service changes
1 February 1994	Introduced as a one-directional semi-express peak-hour service between Bt Merah and Changi Airport (runs express along ECP).
1 December 1997	Re-numbered Service 36. (Related change)

Service 17

Service Gen	Date	Service changes
1st Gen (1981 - 1984)	22 February 1981	Introduced between Changi Point and Prince Edward Rd.
	1983	Amended to Changi Village Ter.
	8 April 1984	Withdrawn.
2nd Gen (1993 - present)	4 April 1993	Re-introduced between Pasir Ris and Bedok under TransitLink Integration Exercise.
	2003	Amended to loop at Bedok Int.
	19 November 2011	Amended to Bedok Temp Int.
	30 November 2014	Amended to air-conditioned Bedok Int.

Service 17A

Date	Service changes
17 April 2006	Introduced as a short-working trip service between Bedok Int and Bedok North Depot.
16 November 2014	Converted to a full-day service under the LTA's Bus Service Enhancement Programme (BSEP).
30 November 2014	Amended to loop at air-conditioned Bedok Int.

Service 18

Date	Service changes
25 August 1984	Introduced between Bedok and Tampines St 22 (loop).
29 November 1987	Extended to Tampines Int via Tampines Ave 7, skipping Tampines St 22. At the same time, re-routed to start from Tampines Int and loop at Bedok Int.
19 November 2011	Amended to loop at Bedok Temp Int. At the same time, amended to ply Bedok North Rd and Bedok North Ave 2, skipping Bedok North St 1 & Bedok North Ave 3.
30 November 2014	Amended to loop at air-conditioned Bedok Int.

Service 19

Service Gen	Date	Service changes
1st Gen (1980 - 1981)	1980	Introduced between Siglap Rd and Prince Edward Rd.
	12 May 1980	Converted to peak-hour one-directional service.
	11 August 1981	Withdrawn.
2nd Gen (1988 - 1990)	19th June 1988	Re-introduced between Bedok and Pasir Ris Dr 6 (loop).
	10 December 1989	Amended to Pasir Ris Int.
	10 March 1990	Merged with Service 4 and withdrawn under Bus-MRT Rationalisation.
3rd Gen (1993 - present)	1993	Re-introduced between Tampines and Changi Airport Cargo Cplx (loop).

Service 20

Service Gen	Date	Service changes
1st Gen (1971 - 1989)	11 April 1971	Introduced between Opera Estate and Commonwealth Ave/North Buona Vista Rd.
	1 December 1971	Handed over to ABS with the revocation of the omnibus license of STC.
	1 July 1973	Amended to Chai Chee Ter.
	7 March 1977	Extended to Ghim Moh Ter.
	15 January 1978	Amended to ply Jln Sultan, Victoria St and Kallang Rd, skipping Jln Kuantan and Jln Sumbawa.
	8 September 1985	Extended to Bedok Int with the closure of Chai Chee Ter. At the same time, alternate trips were introduced towards Ghim Moh Terminal via Siglap Dr and Frankel Ave towards Ghim Moh Ter. Return trips to Bedok Int do not serve Frankel Estate.
	5 November 1989	Withdrawn under Bus-MRT Rationalisation. Deleted sectors between Beach Rd and Ghim Moh Ter were partially covered by Service 100.
2nd Gen (1994 - 2000)	1994	Re-introduced between Sims Place and St. George's Estate (loop).
	Nov 2000	Merged with Service 125 and withdrawn.
3rd Gen (2013 - present)	9 June 2013	Re-introduced between Tampines and Changi Business Park Central 2 (Loop) under the LTA's Bus Service Enhancement Programme (BSEP).