History of Services 1 - 10

Service 1 (1971 - 1989)

Operator	Year	Date	Service changes
ABS	1971	11 April	Introduced between Changi Pt Ter and Delta Circus Ter under 1971 Bus Reorganisation.
	1973	11 March	Amended to ply Zion Rd towards Delta Circus Ter with the partial conversion of Kim Seng Rd to one-way traffic.
	1974	1 December	Amended to ply New Upp Changi Rd, Bedok Plain, Bedok Hts, Upp East Coast Rd and Bedok Rd.
		8 December	Amended to ply the extended Robinson Rd, skipping Market St.
	1975	2 February	Amended to ply Tiong Bahru Rd and the extended Zion Rd towards Delta Circus Ter with the partial conversion of Kim Seng Rd and Outram Rd to one-way traffic.
		2 March	Amended to ply Sims Ave towards Changi Pt Ter with the conversion of Geylang Rd to one-way traffic.
		25 May	Amended to ply Bedok Wk and New Upp Changi Rd, skipping Bedok Hts and Upp East Coast Rd.
		TBC	Amended to new Changi Pt Ter.
		14 November	Amended to ply New Upp Changi Rd, skipping Bedok Plain and Bedok Wk.
	1976	15 February	Serves new staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
	1979	11 February	Amended to ply the extended Shenton Way towards Delta Circus Ter, skipping Parsi Rd and Anson Rd.
		14 October	Amended to ply Sims Ave East towards Changi Pt Ter with the conversion of Changi Rd to one-way traffic.
		11 November	Amended to Delta Fringe Car Pk.
	1980	20 January	Amended to ply Spottiswoode Pk Rd with the partial conversion of Cantonment Rd to one-way traffic.
	1981	15 June	Amended to ply Loyang Ave and Loyang Way with the partial closure of Upp Changi Rd.
		11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
		8 November	Revised to operate on weekdays and Saturdays only.
	1987	6 April	Skips removed bus stop before College Rd along Outram Rd.
	1989	5 November	Discontinued.

Service 1A (1971 - 1974)

Operator	Year	Date	Service changes
ABS	1971	1 August	Introduced between Changi Pt Ter and Delta Circus Ter.
	1973	11 March	Amended to ply Zion Rd towards Delta Circus Ter with the partial conversion of Kim Seng Rd to one-way traffic.
	1974	3 February	Re-numbered Service 3 under 1974 Bus Rationalisation.

Service 2

Refer to Bus Service 2 for more information.

Service 2A (1971 - 1974)

Operator	Year	Date	Service changes
ABS	1971	1 August	Introduced between Changi Pt Ter and Commonwealth Ave Ter.
	1974	3 February	Discontinued under 1974 Bus Rationalisation.

Service 3 (1974 - 1991)

Operator	Route	Year	Date	Service changes
	Changi Point ↔ Delta (1974 - 1976)	1974	3 February	Re-numbered from Service 1A as a service between Changi Pt Ter and Delta Circus Ter.
			1 December	Amended to ply New Upp Changi Rd, Bedok Plain, Bedok Hts, Upp East Coast Rd and Bedok Rd.
		1975	2 February	Amended to ply Tiong Bahru Rd and the extended Zion Rd towards Delta Circus Ter with the partial conversion of Kim Seng Rd and Outram Rd to one-way traffic.
			2 March	Amended to ply Sims Ave towards Changi Pt Ter with the conversion of Geylang Rd to one-way traffic.
			25 May	Amended to ply Bedok Wk and New Upp Changi Rd, skipping Bedok Hts and Upp East Coast Rd.
			TBC	Amended to new Changi Pt Ter.
		1976	15 July	Amended to ply Upp Changi Rd, skipping Telok Paku Rd and Nicoll Dr.
	Bedok South Rd ↺ New Bridge Rd (1976 - 1979)		2 August	Shortened to start from Bedok Sth Rd Ter and loop at New Bridge Rd.
	Bedok ↺ New Bridge Rd (1979 - 1987)	1979	8 April	Amended to Bedok Int and converted to a semi-express service.
			14 October	Amended to ply Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way traffic.
		1983	27 November	Integrated with Service 6 and amended to ply Kallang Rd/Crawford St and Victoria St/Nth Bridge Rd.
		1986	12 January	Converted to trunk service.
			6 July	Serves the bus stop outside Blk 414 along Sims Ave, skipping the bus stop outside Blk 416.
	Bedok ↔ Jurong East (1987 - 1991)	1987	1 February	Extended to Jurong East Int.
			27 September	Amended to ply the extended Eu Tong Sen St towards Bedok Int to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Bedok 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.
		1989	19 February	Serves new bus stop outside Blk 135 along Jurong East St 13.
			19 November	Serves new bus stop outside Kallang Stn along Sims Ave.
		1990	22 July	Serves additional bus stop outside Ellenborough Mkt along Eu Tong Sen St.
		1991	6 January	Discontinued under TransitLink Network Integration Exercise Phase 1.

Service 3 (since 2002)

Refer to Bus Service 3 for more information.

Service 4 (1971 - 1974)

Operator	Year	Date	Service changes
ABS	1971	11 April	Introduced between Changi Pt Ter and Lloyd Leas Est (Loop) under 1971 Bus Reorganisation.
	1974	3 February	Discontinued under 1974 Bus Rationalisation.

Service 4 (1979 - 1993)

Operator	Route	Year	Date	Service changes
	Bedok ↺ Lor 1 Geylang (1979 - 1980)	1979	11 March	Introduced between Bedok Int and Lor 1 Geylang (Loop).
			14 October	Amended to ply Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way traffic.
	Bedok ↺ Moulmein Rd (1980 - 1988)	1980	11 February	Extended to loop at Moulmein Rd.
	Bedok ↔ St. Michael's (1988 - 1990)	1988	31 July	Extended to St. Michael's Ter.
		1989	19 November	Serves new bus stop outside Kallang Stn along Sims Ave.
	Pasir Ris ↔ St. Michael's (1990 - 1992)	1990	11 March	Integrated with Service 19 and extended to Pasir Ris Int.
	Tampines ↔ St. Michael's (1992 - 1993)	1992	29 November	Shortened to Tampines Int under TransitLink Network Integration Exercise Phase 10.
		1993	23 May	Integrated with Services 21 and 67 and discontinued under TransitLink Network Integration Exercise Phase 13.

Service 4 (since 2013)

Refer to Bus Service 4 for more information.

Service 5 (1971 - 1999)

Operator	Route	Year	Date	Service changes
ABC	Upp Changi Rd 8¼ ms ↔ Commonwealth Ave (1971 - 1973)	1971	11 April	Introduced between Upp Changi Rd 8¼ m.s. Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
			28 September	Amended to ply the extended Ganges Ave towards Upp Changi Rd 8¼ m.s. 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.
	Upp Changi Rd 8¼ ms ↔ Bukit Timah (1973 - 1974)	1973	TBC	Extended to Bt Timah Ter.
	Chai Chee ↔ Bukit Timah (1974 - 1977)	1974	3 February	Shortened to Chai Chee Ter under 1974 Bus Rationalisation.
		1975	2 March	Amended to ply Sims Ave towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
	Lor 1 Geylang ↔ Bukit Timah (1977 - 1986)	1977	17 October	Shortened to Geylang Fringe Car Pk and amended to ply Lavender St, Kallang Bahru, Boon Keng Rd and Lor 1 Geylang.
		1979	11 November	Amended to ply Ganges Ave towards Bt Timah Ter with the realignment of Delta Circus.
			30 December	Amended to ply Jln Anak Bt towards Geylang Fringe Car Pk with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1981	15 November	Amended to use new u-turn near Eng Neo Ave towards Geylang Fringe Car Pk, skipping the bus stop outside Turf City along Dunearn Rd and the bus stop after Third Ave along Bt Timah Rd.
	Lor 1 Geylang ↔ Bukit Panjang (1986 - 1999)	1986	1 June	Extended to Zhenghua Ter.
		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.
			13 December	Serves new staggered bus stop opposite Peninsula Plaza along Nth Bridge Rd, skipping the bus stop outside St Andrew's Cath.
		1989	25 June	Skips the bus stop after Tan Boon Chong Ave along Holland Rd.
			19 November	Serves new bus stop outside Kallang Stn along Sims Ave.
		1990	22 July	Serves additional bus stop outside Ellenborough Mkt along Eu Tong Sen St.
		1992	29 March	Amended to ply Holland Ave, Commonwealth Ave, Margaret Dr, Alexandra Rd, Lower Delta Rd, Jln Bt Merah, Kg Bahru Rd and Eu Tong Sen St/New Bridge Rd under TransitLink Network Integration Exercise Phase 6, skipping Queensway, Commonwealth 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 Sth Bridge Rd and Upp Cross St.
		1994	3 July	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, Nth Bridge Rd and Jln Sultan.
		1995	17 September	Operations transferred to TIBS.
		1997	TBC	Serves additional bus stop after Jln Bt Merah along Kg Bahru Rd.
			7 December	Amended to ply Upp Pickering St, Sth Bridge Rd and Neil Rd with the partial closure of New Bridge Rd to facilitate the construction of Chinatown MRT station on the North East MRT Line.
			8 December	Skips the bus stop outside Kallang Stn along Sims Ave.
		1999	26 December	Discontinued under Bt Panjang LRT Rationalisation.

Service 5 (since 2007)

Refer to Bus Service 5 for more information.

Service 6 (1977 - 1983)

Operator	Route	Year	Date	Service changes
	Chai Chee ↺ North Bridge Rd (1977 - 1979)	1977	11 July	Introduced between Chai Chee Ter and Nth Bridge Rd (Loop) as a semi-express service.
	Bedok ↺ North Bridge Rd (1979 - 1983)	1979	25 February	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	27 November	Integrated with Service 3 and discontinued.

Service 6 (since 1993)

Refer to Bus Service 6 for more information.

Service 7

Refer to Bus Service 7 for more information.

Service 8 (1979 - 1989)

Operator	Route	Year	Date	Service changes
	Bedok ↺ Shenton Way (1979 - 1982)	1979	26 February	Introduced between Bedok Int and Shenton Way (Loop) as a semi-express service, operating on weekdays and Saturdays only.
			14 October	Amended to ply Sims Ave East towards Bedok Int with the conversion of Changi 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.
	Bedok ↺ Robinson Rd (1982 - 1986)	1982	5 April	Amended to ply Bedok Sth Rd, Bedok Sth Ave 1 and ECP, skipping Connaught Dr, Collyer Quay, Raffles Quay and Shenton Way.
	Bedok ↺ Marina Ctr (1986 - 1989)	1986	30 November	Extended to loop at Marina Ctr.
		1989	6 November	Discontinued.

Service 8 (since 1990)

Refer to Bus Service 8 for more information.

Service 9

Refer to Bus Service 9 for more information.

Service 10

Refer to Bus Service 10 for more information.