History of Services 1 - 10

Service 1

Year	Date	Service changes
1971	11 April	Introduced between Changi Point Ter and Havelock Rd Ter under 1971 Bus Reorganisation.
1974	1 December	Amended to ply New Changi Rd, Bedok Plain, Bedok Heights, Upp East Coast Rd and Bedok Rd.
1975	TBC	Amended to the relocated Changi Point Ter.
	14 November	Amended to ply New Changi Rd (now known as New Upp Changi Rd).
1979	11 November	Amended to Delta Fringe Car Park.
1981	TBC	Ceased to operate on Sundays and public holidays.
1989	6 November	Withdrawn under Bus-MRT Rationalisation.

Service 1A

Year	Date	Service changes
1971	1 August	Introduced between Changi Point Ter and Havelock Rd Ter.
1974	3 February	Re-numbered Service 3 under 1974 Bus Rationalisation. (Related change)

Service 2

Year	Date	Service changes
1971	11 April	Introduced between Changi Point Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
1974	1 December	Amended to ply New Changi Rd, Bedok Plain, Bedok Heights, Upp East Coast Rd and Bedok Rd.
1975	TBC	Amended to the relocated Changi Point Ter.
	14 November	Amended to ply New Changi Rd (now known as New Upp Changi Rd).
1980	28 December	Amended to ply Jln Bt Merah and Kg Bahru Rd in both directions, skipping Outram Rd, Tiong Bahru Rd, Henderson Rd.
1982	TBC	Amended to Buona Vista Ter.
1992	29 November	Shortened to New Bridge Rd Ter under TransitLink Integration Exercise.
1993	11 April	Amended to ply Jln Sultan, Victoria St, Hill St and New Bridge Rd, skipping South Bridge Rd and Neil Rd.
1994	3 July	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, North Bridge Rd and Jln Sultan.
1997	TBC	Amended to ply South Bridge Rd with the partial closure of New Bridge Rd to facilitate the construction of Chinatown MRT station on the North East MRT Line.
2002	TBC	Amended to ply the reinstated New Bridge Rd, skipping South Bridge Rd.
2013	29 December	Amended to ply Upp Changi Link with the partial closure of Upp Changi Rd.

Service 2A

Year	Date	Service changes
1971	1 August	Introduced between Changi Point Ter and Commonwealth Ave Ter.
1974	3 February	Withdrawn under 1974 Bus Rationalisation.

Service 3

Service Gen	Year	Date	Service changes
1st Gen (1974 - 1991)	1974	3 February	Re-numbered from Service 1A as a service between Changi Point Ter and Havelock Rd Ter. (Related change)
		1 December	Amended to ply New Changi Rd, Bedok Plain, Bedok Heights, Upp East Coast Rd and Bedok Rd.
	1975	TBC	Amended to the relocated Changi Point Ter.
		30 November	Amended to ply Bedok Plain and Bedok Walk (now known as Bedok South Rd and Bedok South Ave 3 respectively).
	1976	15 July	Amended to ply Upp Changi Rd, skipping Telok Paku Rd and Nicoll Dr.
	1977	27 February	Shortened to Bedok South Rd Ter.
	1979	8 April	Amended to Bedok Int. At the same time, shortened to loop at New Bridge Rd and converted to a semi-express service.
	1983	27 November	Integrated with Service 6 and amended to ply Kallang Rd/Crawford St and Victoria St/North Bridge Rd.
	1986	12 January	Converted to trunk service.
	1987	26 January	Extended to Jurong East Int.
	1988	20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
	1991	6 January	Withdrawn under TransitLink Integration Exercise.
2nd Gen (2002 - present)	2002	7 April	Re-introduced between Tampines Int and Pasir Ris St 71 (loop) with the integration of Feeder Service 294 and Townlink Service 357.
	2003	19 October	Extended to loop at Punggol Central.
		30 November	Amended to Punggol Temp Int.
	2015	12 December	Amended to ply the extended Pasir Ris Dr 8 with the permanent closure of the west ring of Pasir Ris Central.

Service 4

Service Gen	Year	Date	Service changes
1st Gen (1971 - 1974)	1971	11 April	Introduced between Changi Point Ter and Lloyd Leas Estate (loop) under 1971 Bus Reorganisation.
	1974	3 February	Withdrawn under 1974 Bus Rationalisation.
2nd Gen (1979 - 1993)	1979	11 March	Re-introduced between Bedok Int and Lor 1 Geylang (loop).
	1980	TBC	Extended to loop at Moulmein Rd.
	1988	31 July	Extended to St. Michael's Ter under Bus-MRT Rationalisation.
	1990	10 March	Integrated with Service 19 and extended to Pasir Ris Int under Bus-MRT Rationalisation.
	1992	29 November	Shortened to Tampines Int under TransitLink Integration Exercise.
	1993	23 May	Integrated with Services 21 and 67 and withdrawn under TransitLink Integration Exercise.
3rd Gen (2013 - present)	2013	17 March	Re-introduced between Tampines Int and Changi North Way (loop) under the LTA's Bus Service Enhancement Programme (BSEP).

Service 5

Service Gen	Year	Date	Service changes
1st Gen (1971 - 1995)	1971	11 April	Introduced between Bedok Rd Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
	1973	TBC	Extended to Bt Timah Ter.
	1974	3 February	Shortened to Chai Chee Ter under 1974 Bus Rationalisation.
	1977	17 October	Shortened to Geylang Fringe Car Park.
	1986	1 June	Extended to Zhenghua Ter.
	1987	11 October	Amended to Bt Panjang Ter.
	1992	29 March	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.
	1993	11 April	Amended to ply Jln Sultan, Victoria St, Hill St and New Bridge Rd, skipping South Bridge Rd and Upp Cross St.
	1994	3 July	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, North Bridge Rd and Jln Sultan.
	1995	17 September	Handed over to Trans-Island Bus Service (TIBS). (Related change)
2nd Gen (2007 - present)	2007	11 March	Re-introduced between Pasir Ris Int and Bt Merah Int.
	2011	28 August	Amended to ply Jln Tenaga and Jln Damai with the partial closure of Kaki Bt Ave 1 to facilitate the construction of Kaki Bukit MRT station on the Downtown MRT Line.
	2016	24 April	Amended to ply the reinstated Kaki Bt Ave 1, skipping Jln Tenaga and Jln Damai.

Service 6

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

Service 7

Year	Date	Service changes
1979	11 March	Introduced between Bedok Int and Holland Rd Fringe Car Park (loop) as a semi-express service, replacing Blue Arrow Service 307.
1985	6 January	Extended to Jurong East Central Ter.
	30 June	Amended to Jurong East Int.
	29 August	Converted to trunk service.
1989	5 November	Amended to ply Mountbatten Rd, Geylang Rd, Kallang Rd/Crawford St and Victoria St/North Bridge Rd under Bus-MRT Rationalisation, skipping Nicoll Highway.
1991	7 April	Shortened to Clementi Int and amended to ply Clementi Ave 5 under TransitLink Integration Exercise, skipping Commonwealth Ave West and Clementi Ave 2.
	28 April	Amended to ply Clementi Ave 5 towards Clementi Int.
1992	TBC	Amended to ply Orchard Link, skipping Grange Rd.
2005	5 June	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
	2 July	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd and amended to ply Grange Rd with the partial closure of Somerset Rd.
2006	29 October	Amended to Clementi Temp Int.
2011	19 November	Amended to Bedok Temp Int.
	26 November	Amended to Clementi Integrated Transport Hub.
2014	30 November	Amended to Bedok Integrated Transport Hub.

Service 8

Service Gen	Year	Date	Service changes
1st Gen (1979 - 1989)	1979	26 February	Introduced between Bedok Int and Shenton Way (loop) as a semi-express service, operating on weekdays and Saturdays only.
	1983	TBC	Amended to ply Bedok South Rd, Bedok South Ave 1 and ECP, skipping Connaught Dr, Collyer Quay, Raffles Quay and Shenton Way.
	1986	1 December	Extended to loop at Raffles Blvd.
	1989	6 November	Withdrawn under Bus-MRT Rationalisation.
2nd Gen (1990 - present)	1990	1 March	Re-introduced between Pasir Ris Int and Toa Payoh Int.
	1992	29 November	Shortened to Tampines Int under TransitLink Integration Exercise.
	1994	5 March	Amended to ply Lor 6 Toa Payoh towards Toa Payoh Int.
	1995	18 September	Amended to ply Tampines Ave 1 and Bedok North Rd with the opening of Temasek Polytechnic.
	1998	31 May	Amended to Toa Payoh Temp Int.
	2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
	2011	4 September	Amended to skip Serangoon Rd towards Toa Payoh Integrated Transport Hub with the permanent closure of Whampoa North.

Service 9

Year	Date	Service changes
1979	8 April	Introduced between Geylang Fringe Car Park and Changi Point Ter.
1983	25 June	Integrated with Services 391 and 395 and extended to loop at Changi Airport Cargo Complex under Changi Airport Bus Plan 1983.
1985	15 December	Amended to ply Loyang Ave, skipping Loyang Way.
1988	10 April	Amended to ply Upp Changi Rd East, Simei Rd, Tampines St 31, Tampines Ave 2 and Tampines Ave 7, skipping Bedok Rd and Upp Changi Rd.
1992	29 November	Shortened to Bedok Int under TransitLink Integration Exercise.
1995	15 January	Amended to ply Bedok Rd, Upp Changi Rd, Simei Ave and Simei St 3, skipping Upp Changi Rd East.
2011	19 November	Amended to Bedok Temp Int.
2014	30 November	Amended to Bedok Integrated Transport Hub.

Service 10

Year	Date	Service changes
1971	11 April	Introduced between Bedok Rd Ter and Prince Edward Rd Ter under 1971 Bus Reorganisation.
	16 June	Extended to Shipyard Rd Ter.
1975	TBC	Amended to Upp Changi Rd 13.3km Ter.
1978	1 June	Amended to Jurong Int.
1979	TBC	Relocated to Upp Changi Rd 15.5km Ter.
1980	15 June	Amended to Somapah Int.
1984	27 April	Extended to Tampines Ave 5 Ter.
1987	29 November	Amended to Tampines Int.
1990	1 July	Shortened to Clementi Int with the opening of Boon Lay Int.
1992	28 June	Amended to Tg Katong Rd, Dunman Rd and Old Airport Rd under TransitLink Integration Exercise.
1999	7 March	Shortened to Kent Ridge Ter with the introduction of Service 188.
2000	TBC	Amended to ply Esplanade Dr, skipping Connaught Dr/Empress Pl.
2004	20 April	Amended to ply Mountbatten Rd, Kallang Rd, Victoria St, Jln Sultan, Beach Rd and Bras Basah Rd/Stamford Rd with the temporary closure of Nicoll Highway.
	6 December	Amended to ply the reinstated Nicoll Highway, skipping Mountbatten Rd, Kallang Rd, Victoria St, Jln Sultan, Beach Rd and Bras Basah Rd/Stamford Rd.
2006	19 March	Amended to ply Guillemard Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction of Dakota MRT station on the Circle MRT Line.
2008	29 December	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Guillemard Rd.

Service 11

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

Service 12

Year	Date	Service changes
1971	11 April	Introduced between Bedok Rd Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
1974	3 February	Amended to Upp Changi Rd 13.3km Ter under 1974 Bus Rationalisation.
1979	TBC	Relocated to Upp Changi Rd 15.5km.
1980	15 June	Amended to Somapah Int.
	28 December	Amended to ply Upp Changi Rd.
1982	TBC	Amended to Buona Vista Ter.
1987	27 September	Amended to ply South Bridge Rd and Eu Tong Sen St, skipping Upp Circular Rd.
1988	23 October	Extended to Pasir Ris Ter and amended to New Bridge Rd Ter under Bus-MRT Rationalisation.
1989	10 December	Amended to Pasir Ris Int.
1993	11 April	Amended to ply Jln Sultan, Victoria St, Hill St and New Bridge Rd, skipping South Bridge Rd and Upp Cross St.
1994	3 July	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, North Bridge Rd and Jln Sultan.
1997	TBC	Amended to ply South Bridge Rd with the partial closure of New Bridge Rd to facilitate the construction of Chinatown MRT station on the North East MRT Line.
2002	TBC	Amended to ply the reinstated New Bridge Rd, skipping South Bridge Rd.
2005	5 June	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
	2 July	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.

Service 12A

Year	Date	Service changes
1979	31 December	Introduced between Bedok South Ave 3 and North Bridge Rd (loop) as a peak hour variant of Service 12 on weekdays.
1984	3 September	Withdrawn.

Service 13

Year	Date	Service changes
1971	11 April	Introduced between Bedok Rd Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
	9 May	Amended to ply Upp Changi Rd, Changi Rd, Geylang Rd, Kallang Rd, Crawford St, North Bridge Rd and Stamford Rd.
1974	3 February	Amended to Upp Changi Rd 13.3km Ter under 1974 Bus Rationalisation.
	24 February	Amended to ply Grange Rd and Orchard Blvd with the conversion of Orchard Rd to one-way road, skipping Orchard Rd and Tanglin Rd.
1975	16 November	Amended to Chai Chee Ter.
1977	7 March	Extended to Ghim Moh Ter.
1985	8 September	Extended to Bedok Int with the closure of Chai Chee Ter.
1987	12 April	Shortened to Eunos Ter.
1989	5 November	Extended to Yio Chu Kang Ter under Bus-MRT Rationalisation.
	10 December	Amended to Eunos Int.
1990	2 September	Amended to ply Bishan St 22 and Marymount Rd under TransitLink Integration Exercise, skipping Ang Mo Kio Ave 1.
1998	TBC	Extended to Marine Parade Ter with the route amendment of Service 15.
2001	16 September	Amended to loop at Siglap Rd with the closure of Marine Parade Ter.
	9 December	Extended to Upp East Coast Ter.

Service 13A

Year	Date	Service changes
1971	11 April	Introduced between Bedok Rd Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
1974	3 February	Shortened to loop at Mei Chin Rd and re-numbered Service 14 under 1974 Bus Rationalisation. (Related change)

Service 14

Year	Date	Service changes
1974	3 February	Re-numbered from Service 13A as a service between Bedok Rd Ter and Mei Chin Rd (loop). (Related change)
	24 February	Amended to ply Grange Rd and Orchard Blvd with the conversion of Orchard Rd to one-way road, skipping Orchard Rd and Tanglin Rd.
1976	TBC	Amended to Upp Changi Rd 8¼ ms (13.3 km) Ter.
1978	4 September	Amended to ply Nicoll Highway, skipping Kallang Rd.
1979	TBC	Relocated to Upp Changi Rd 15.5km Ter.
	2 December	Extended to Jln Bt Merah Ter and amended to ply Napier Rd, Holland Rd and Queensway, skipping Tanglin Rd, Alexandra Rd, Commonwealth Ave, Stirling Rd, Mei Chin Rd and Mei Ling St.
	23 December	Amended to Bt Merah Central Ter.
1980	15 June	Amended to Somapah Int.
	28 September	Amended to Bt Merah Int.
1986	16 March	Amended to ply Kallang Park/National Stadium.
	13 April	Amended to ply Stadium Rd, skipping Stadium Walk.
1989	5 November	Extended to Changi Village Ter under Bus-MRT Rationalisation.
1991	20 January	Shortened to Bedok Int under TransitLink Integration Exercise.
1992	TBC	Amended to ply Orchard Link, skipping Grange Rd.
	29 March	Amended to ply Bt Merah Central under TransitLink Integration Exercise.
1993	23 May	Integrated with Service 92 and extended to Clementi Int under TransitLink Integration Exercise, skipping National Stadium, Tanglin Rd/Orchard Blvd, Napier Rd, Holland Rd and Queensway.
2004	20 April	Amended to ply Mountbatten Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd with the partial closure of Nicoll Highway.
	6 December	Amended to ply the reinstated Nicoll Highway, skipping Mountbatten Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd.
2005	2 July	Amended to ply Grange Rd with the partial closure of Somerset Rd.
2006	29 October	Amended to Clementi Temp Int.
2011	19 November	Amended to Bedok Temp Int.
	26 November	Amended to Clementi Integrated Transport Hub.
2014	30 November	Amended to Bedok Integrated Transport Hub.

Service 15

Service Gen	Year	Date	Service changes
1st Gen (1975 - 1984)	1975	22 June	Introduced between Marine Terrace Ter and Prince Edward Rd Ter.
	1976	4 July	Extended to loop at Shenton Way.
	1981	TBC	Amended to Marine Parade Ter.
	1984	16 September	Integrated with Service 196 and withdrawn.
2nd Gen (1995 - present)	1995	18 September	Re-introduced between Pasir Ris Int and Eunos Int with the opening of Temasek Polytechnic.
	1997	TBC	Integrated with Service M4 and extended to loop at Marine Parade Rd.
	1998	TBC	Amended to skip Marine Cres with the route extension of Service 13.
	2011	28 August	Amended to ply Jln Tenaga and Jln Damai with the partial closure of Kaki Bt Ave 1 to facilitate the construction of Kaki Bukit MRT station on the Downtown MRT Line.
	2016	24 April	Amended to ply the reinstated Kaki Bt Ave 1, skipping Jln Tenaga and Jln Damai.

Service 16

Year	Date	Service changes
1976	2 May	Introduced between Marine Terrace Ter and Telok Blangah Heights Ter.
1981	15 February	Amended to Bt Merah Int.
	TBC	Amended to Marine Parade Ter.
1983	TBC	Amended to ply Stadium Walk after 1930 hours daily.
1986	13 April	Amended to ply Stadium Rd, skipping Stadium Walk during the evening diversion into Kallang Park/National Stadium.
1987	23 February	Amended to Stadium Rd after 1845 hours daily.
1992	TBC	Amended to ply Orchard Link, skipping Grange Rd.
1993	TBC	Amended to ply Stadium Rd permanently.
	5 December	Integrated with Service 149 and extended to loop at Changi Airport and amended to ply Zion Rd/Kim Seng Rd, Outram Rd and Tiong Bahru Rd, skipping River Valley Rd, Delta Rd and Lower Delta Rd under TransitLink Integration Exercise.
1996	TBC	Amended to terminate at Changi Airport.
1998	6 September	Shortened to Marine Parade Ter with the conversion of Service 36 to a full day trunk service.
2001	16 September	Amended to loop at Siglap Rd with the closure of Marine Parade Ter.
2002	8 February	Amended to ply Stadium Walk and Stadium Cres with the partial closure of Stadium Blvd to facilitate the construction of Stadium MRT station along the Circle MRT Line.
2004	20 April	Amended to ply Mountbatten Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd with the temporary closure of Nicoll Highway.
	6 December	Amended to ply the reinstated Nicoll Highway, skipping Mountbatten Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd.
2005	2 July	Amended to ply Grange Rd with the partial closure of Somerset Rd.
2006	18 February	Amended to ply Stadium Cres with the full closure of Stadium Blvd to facilitate the construction of Stadium MRT station along the Circle MRT Line.
	19 March	Amended to ply Guillemard Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction of Dakota MRT station along the Circle MRT Line.
2007	19 August	Extended to Bedok Int.
2008	29 December	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Guillemard Rd.
2010	29 September	Amended to ply Mountbatten Rd with the closure of Stadium Rd/Stadium Dr to facilitate the construction of the Singapore Sports Hub.
2011	19 November	Amended to Bedok Temp Int.
2014	30 November	Amended to Bedok Integrated Transport Hub.

Service 16E

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

Service 17

Service Gen	Year	Date	Service changes
1st Gen (1981 - 1984)	1981	22 February	Introduced between Changi Point Ter and Prince Edward Rd Ter, operating on weekdays and Saturdays only.
	1984	9 April	Withdrawn.
2nd Gen (1993 - present)	1993	4 April	Re-introduced between Pasir Ris Int and Bedok Int under TransitLink Integration Exercise.
	2003	TBC	Amended to loop at Bedok Int.
	2011	19 November	Amended to loop at Bedok Temp Int.
	2014	30 November	Amended to loop at Bedok Integrated Transport Hub.

Service 17A

Year	Date	Service changes
2014	16 November	Converted from a short working trip as a full day service between Bedok North Depot and Bedok Temp Int (Loop) under the LTA's Bus Service Enhancement Programme (BSEP).
	30 November	Amended to loop at Bedok Integrated Transport Hub.

Service 18

Year	Date	Service changes
1984	25 August	Introduced between Bedok Int and Tampines Ave 2 (loop).
1985	3 November	Amended to loop at Tampines St 22.
1987	29 November	Extended to start from Tampines Int and loop at Bedok Int, skipping Tampines St 22.
2011	19 November	Amended to loop at Bedok Temp Int and amended to ply Bedok North Rd and Bedok North Ave 2, skipping Bedok North Ave 3 and Bedok North St 1.
2014	30 November	Amended to loop at Bedok Integrated Transport Hub.

Service 19

Service Gen	Year	Date	Service changes
1st Gen (1980 - 1981)	1980	TBC	Introduced between Siglap Rd and Prince Edward Rd Ter.
		12 May	Converted to peak-hour one-directional service on weekdays and Saturdays only.
	1981	11 August	Withdrawn.
2nd Gen (1988 - 1990)	1988	19 June	Re-introduced between Bedok Int and Pasir Ris Dr 6 (loop).
	1989	10 December	Amended to Pasir Ris Int.
	1990	10 March	Integrated with Service 4 and withdrawn under Bus-MRT Rationalisation.
3rd Gen (1993 - present)	1993	TBC	Re-introduced between Tampines Int and Changi Airport Cargo Complex (loop) as a day service with the permanent amendment of Service 29 to loop at Changi Village Ter.

Service 20

Service Gen	Year	Date	Service changes
1st Gen (1971 - 1989)	1971	11 April	Introduced between Fidelio St Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
		6 December	Handed over to Associated Bus Services (ABS) with the revocation of the omnibus license of Singapore Traction Company (STC).
	1973	1 July	Amended to Chai Chee Ter.
	1977	7 March	Extended to Ghim Moh Ter.
	1978	15 January	Amended to ply Jln Sultan, skipping Sumbawa Rd.
	1985	8 September	Extended to Bedok Int with the closure of Chai Chee Ter with alternate trips introduced towards Ghim Moh Ter via Siglap Dr and Frankel Ave.
	1989	5 November	Withdrawn under Bus-MRT Rationalisation.
2nd Gen (1994 - 2000)	1994	TBC	Re-introduced between Sims Pl Ter and St. Wilfred Rd (loop).
	2000	TBC	Integrated with Service 125 and withdrawn.
3rd Gen (2013 - present)	2013	9 June	Re-introduced between Tampines Int and Changi Business Park Central 2 (loop) under the LTA's Bus Service Enhancement Programme (BSEP).