History of Services 21 - 30

Service 21

Operator	Service Gen	Year	Date	Service changes
Amalgamated Bus Company	1st Gen (1971 - 1981)	1971	11 April	Introduced between Fidelio St Ter and Delta Circus Ter under 1971 Bus Reorganisation.
			25 April	Extended to Commonwealth Ave Ter.
		1973	11 March	Amended to ply Zion Rd towards Commonwealth Ave Ter with the partial conversion of Kim Seng Rd to one-way traffic.
			1 July	Amended to Chai Chee Ter.
		1975	2 February	Amended to ply Tiong Bahru Rd and the extended Zion Rd towards Commonwealth Ave Ter with the partial conversion of Kim Seng Rd and Outram Rd to one-way traffic.
			2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
		1981	15 November	Withdrawn.
	2nd Gen (Since 1992)	1992	29 November	Re-introduced between Pasir Ris Int and Lor 1 Geylang Ter under TransitLink Network Integration Exercise Phase 10.
		1993	23 May	Integrated with Service 4 and extended to St Michael's Ter under TransitLink Network Integration Exercise Phase 13.
		1994	TBC	Skips the bus stop outside Kallang Stn along Sims Ave.
		1999	TBC	Serves new pair of bus stops outside and opposite The Clearwater Condo along Bedok Reservoir Rd.
		2001	18 February	Serves new staggered bus stop outside Novena Stn along Thomson Rd, skipping the bus stop outside Novena Church.
Template:SBS Transit (Current)		2002	TBC	Serves new pair of bus stops opposite and between Blks 731 and 734 along Bedok Reservoir Rd.
		2003	21 June	Amended to ply Bendemeer Rd, Jln Besar, Kitchener Rd and Serangoon Rd under North East MRT Line Rationalisation Phase 1.
		2004	27 April	Amended to ply Geylang Rd, Kallang Rd and Sims Ave towards St. Michael's Ter with the temporary conversion of Lor 1 Geylang to one-way traffic.
			6 December	Amended to ply the reinstated Lor 1 Geylang towards St. Michael's Ter, skipping Geylang Rd, Kallang Rd and Sims Ave.
		2006	26 June	Designated wheelchair-accessible bus service (WAB).
		2016	24 April	Amended to ply Jln Tenteram in both directions.

Service 21A

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2014	25 May	Introduced as a short-trip service from Geylang Rd (Bef Lor 18 Geylang) to Kitchener Rd (Bef Tai Hoe Hotel) on Sundays and Public Holidays. Wheelchair-accessible at launch.

Service 22

Operator	Service Gen	Year	Date	Service changes
Amalgamated Bus Company	1st Gen (1971 - 1984)	1971	11 April	Introduced between Fidelio St Ter and Alexandra Rd Ter.
		1972	TBC	Extended to Tg Berlayer Ter.
		1973	1 July	Amended to Chai Chee Ter.
		1974	3 February	Amended to skip Fidelio St 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.
		1979	14 October	Amended to ply Sims Ave East towards Chai Chee Ter with the conversion of Changi Rd to one-way traffic.
		1984	22 April	Withdrawn.
	2nd Gen (Since 1988)	1988	24 January	Re-introduced between Ang Mo Kio Int and Tampines Int.
		1999	TBC	Serves new pair of bus stops outside and opposite The Clearwater Condo along Bedok Reservoir Rd.
Template:SBS Transit (Current)		2002	24 March	Amended to Ang Mo Kio Temp Int.
			TBC	Serves new pair of bus stops opposite and between Blks 731 and 734 along Bedok Reservoir Rd.
		2003	21 June	Amended to ply Serangoon Central and Upp Serangoon Rd under North East MRT Line Rationalisation Phase 1.
		2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
		2011	7 March	Designated wheelchair-accessible bus service (WAB).
		2013	22 September	Serves new bus stop outside Wisma AUPE along Upp Paya Lebar Rd.
		2017	12 February	Serves new pair of bus stops before and after Ubi Rd 3 along Ubi Ave 2 and additional pair of bus stops outside and opposite Our Tampines Hub along Tampines Ave 5.

Service 23

Operator	Year	Date	Service changes
	1983	20 February	Introduced between Tampines Ter and Tomlinson Rd (Loop).
	1987	29 November	Amended to Tampines Int.
	1988	23 October	Skips a pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	1991	6 January	Shortened to loop at Rochor Canal Rd under TransitLink Network Integration Exercise Phase 1.
	1995	18 September	Amended to ply Tampines Ave 1, Tampines Ave 10 and Bedok North Rd with the opening of Temasek Polytechnic.
	1997	TBC	Serves additional pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	2000	TBC	Serves new pair of bus stops outside and opposite Tropica Condo along Tampines Ave 1.
Template:SBS Transit (Current)	2007	TBC	Serves new pair of bus stops outside Kallang Basin Swim Cplx and after Infineon along Jln Kolam Ayer.
	2017	21 August	Designated wheelchair-accessible bus service (WAB).
		21 October	Serves new bus stop outside Bedok North Stn along Bedok North Rd.

Service 23A

Operator	Year	Date	Service changes
Template:SBS Transit	2006	28 August	Introduced as a short-trip service from Tampines Int to Tampines Ave 1 (Temasek Poly West G) during morning peak hours on weekdays.
	2010	TBC	Withdrawn.

Service 24

Operator	Year	Date	Service changes
	1983	25 June	Introduced between Ang Mo Kio Int and Changi Airport PTB (Loop) with the merger of SBS Services 392, 394 and SSB Service 727 under Changi Airport Bus Plan 1983.
	1990	13 October	Amended to serve Changi Airport PTB 2.
	1996	TBC	Converted to bi-directional service between Ang Mo Kio Int and Changi Airport PTB 1.
	1999	TBC	Serves new pair of bus stops outside and opposite SATS Flight Kitchen along Airport Blvd.
Template:SBS Transit (Current)	2002	24 March	Amended to Ang Mo Kio Temp Int.
	2003	16 March	Amended to ply Eunos Rd 5 and Eunos Rd 8 with the partial closure of Paya Lebar Rd to facilitate the construction of Paya Lebar MRT station on the Circle MRT Line.
	2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
		11 November	Amended to serve Changi Airport PTB 3.
	2009	23 August	Amended to ply the reinstated Paya Lebar Rd, skipping Eunos Rd 5 and Eunos Rd 8.
	2010	2 December	Designated wheelchair-accessible bus service (WAB).
	2012	9 January	Converted to loop service between Ang Mo Kio Int and Changi Airport PTB 2.
	2013	22 September	Serves new bus stop outside Wisma AUPE along Upp Paya Lebar Rd.
	2017	22 October	Amended to serve Changi Airport PTB 4.
	2018	8 April	Serves new pair of bus stops after Somapah Rd and before Simei Rd along Upp Changi Rd East.

Service 24A

Operator	Year	Date	Service changes
Template:SBS Transit	2002	24 February	Introduced as a short-trip service from Ang Mo Kio Temp Int to New Upp Changi Rd (Tanah Merah Stn).
	2004	TBC	Withdrawn.

Service 25

Operator	Year	Date	Service changes
	1979	28 October	Introduced between Ang Mo Kio Ave 3 Ter and Bedok Int.
	1981	5 July	Amended to Ang Mo Kio Central 2 Ter.
	1983	10 April	Amended to Ang Mo Kio Int.
	1985	7 July	Amended to ply Ang Mo Kio Ave 3, Hougang Ave 2, Hougang Ave 3, Eunos Link and Jln Eunos, skipping Ang Mo Kio Ave 8, Ang Mo Kio Ave 1, Boundary Rd, Upp Paya Lebar Rd and Paya Lebar Rd.
Template:SBS Transit (Current)	2002	24 March	Amended to Ang Mo Kio Temp Int.
	2005	19 January	Serves additional pair of bus stops outside Jubilee and opposite Blk 710 along Ang Mo Kio Ave 8.
	2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
	2011	19 November	Amended to Bedok Temp Int.
	2012	26 March	Designated wheelchair-accessible bus service (WAB).
	2014	30 November	Amended to Bedok Integrated Transport Hub.
	2017	9 April	Extended to Upp East Coast Ter.

Service 25A

Operator	Year	Date	Service changes
	2000	TBC	Introduced as a short-trip service from Ang Mo Kio Int to Hougang Ave 3 (Aft Kim Chuan Rd) during morning peak hours on weekdays.
Template:SBS Transit	2002	24 March	Amended to Ang Mo Kio Temp Int.
	2003	TBC	Withdrawn.

Service 26

Operator	Year	Date	Service changes
	1981	12 July	Introduced between Bedok Int and Bendemeer Rd (Loop).
	1989	27 August	Integrated with Service 148 and extended to Toa Payoh Int.
		19 November	Serves new bus stop outside Kallang Stn along Sims Ave.
	1994	5 March	Amended to ply Kim Keat Link and Lor 6 Toa Payoh towards Toa Payoh Int.
		11 July	Amended to ply Jln Kolam Ayer, Bendemeer Rd, Whampoa North and Serangoon Rd.
		TBC	Skips the bus stop outside Kallang Stn along Sims Ave.
	1998	31 May	Amended to temporary site of Toa Payoh Int.
			Serves new pair of bus stops outside and opposite Toa Payoh Swim Cplx along Lor 6 Toa Payoh.
Template:SBS Transit (Current)	2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
	2003	4 May	Amended to ply Geylang Bahru, Bendemeer Rd, Whampoa East and Serangoon Rd, skipping Jln Kolam Ayer and Whampoa North.
	2004	27 April	Amended to ply Geylang Rd, Kallang Rd and Sims Ave towards Toa Payoh Integrated Transport Hub with the temporary conversion of Lor 1 Geylang to one-way traffic.
		6 December	Amended to ply the reinstated Lor 1 Geylang towards Toa Payoh Integrated Transport Hub, skipping Geylang Rd, Kallang Rd and Sims Ave.
	2005	TBC	Serves an additional bus stop outside City Plaza along Geylang Rd.
	2011	19 November	Amended to Bedok Temp Int.
	2014	23 March	Designated wheelchair-accessible bus service (WAB).
		30 November	Amended to Bedok Integrated Transport Hub.
	2016	12 June	Amended to ply Chai Chee St and Chai Chee Dr, skipping New Upp Changi Rd.

Service 27

Operator	Year	Date	Service changes
	1988	24 January	Introduced between Tampines Int and Changi Airport PTB (Loop).
		23 October	Skips a pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	1990	13 October	Amended to serve Changi Airport PTB 2.
	1992	29 November	Extended to Pasir Ris Int under TransitLink Network Integration Exercise Phase 10.
	1993	24 January	Amended to serve Tampines Int in both directions and amended to ply Pasir Ris St 52.
	1995	18 September	Shortened to Tampines Int with the introduction of Service 15.
	1996	TBC	Converted to bi-directional service between Tampines Int and Changi Airport PTB 1.
	1997	TBC	Serves additional pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	1999	TBC	Serves new pair of bus stops outside and opposite SATS Flight Kitchen along Airport Blvd.
		25 July	Extended to Sengkang Ter.
		5 December	Serves new pair of bus stops outside Blk 190C and outside Blk 298A along Punggol Rd.
	2001	28 April	Amended to temporary site of Sengkang Int.
Template:SBS Transit (Current)	2002	TBC	Serves new pair of bus stops before and after TPE along Tampines Ave 10.
		TBC	Serves new pair of bus stops before and after Tampines Ave 9 along Tampines Ave 10.
		29 December	Extended to Hougang Central Int.
	2007	11 November	Amended to serve Changi Airport PTB 3.
	2009	26 October	Designated wheelchair-accessible bus service (WAB).
	2012	9 January	Converted to loop service between Hougang Central Int and Changi Airport PTB 2.
	2014	24 August	Serves new pair of bus stops before and after Punggol Rd along TPE.
	2015	8 November	Serves new pair of bus stops outside and opposite CityLife @ Tampines along Tampines Ave 9.

Service 27A

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2003	TBC	Re-introduced as a short-trip service from Compassvale Rd (Opp Blk 240) to Tampines Ave 5 (Blk 147) during morning peak hours on weekdays.
	2009	17 August	Shortened to start from Sengkang East Ave (Blk 203B) and terminate at Tampines Ave 4 (Opp Century Sq).
		26 October	Designated wheelchair-accessible bus service (WAB).
	2014	24 August	Serves new bus stop after Punggol Rd along TPE.
	2015	8 November	Serves new bus stop opposite CityLife @ Tampines along Tampines Ave 9.

Service 27B

Operator	Year	Date	Service changes
Template:SBS Transit	2007	26 March	Introduced as a short-trip service from Tampines Ave 5 (Blk 938) to Compassvale Rd (Blk 240) during evening peak hours on weekdays.
	2008	TBC	Withdrawn.

Service 28

Operator	Service Gen	Year	Date	Service changes
	1st Gen (1983 - 1992)	1983	4 September	Introduced between Tampines Ter and New Bridge Rd (Loop).
		1987	3 May	Amended to terminate at New Bridge Rd Ter.
			6 June	Amended to the relocated New Bridge Rd Ter.
			27 September	Amended to ply the extended Eu Tong Sen St towards Tampines Ave 5 Ter to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Tampines Ave 5 Ter to facilitate the second stage of road expansion along New Bridge Rd.
			29 November	Amended to Tampines Int.
			13 December	Serves new staggered bus stop opposite Peninsula Plaza along North Bridge Rd, skipping the bus stop outside St Andrew's Cathedral.
		1988	20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
			23 October	Skips a pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
		1989	19 November	Serves new bus stop outside Kallang Stn along Sims Ave.
		1990	22 July	Serves additional bus stop outside Ellenborough Market along Eu Tong Sen St.
		1992	29 November	Integrated with Service 2 and withdrawn under TransitLink Network Integration Exercise Phase 10.
	2nd Gen (Since 1994)	1994	2 October	Introduced between Tampines Int and Bedok Int (Loop).
		1999	TBC	Serves new pair of bus stops outside and opposite The Clearwater Condo along Bedok Reservoir Rd.
		2000	29 October	Integrated with Service 152 and extended to Toa Payoh Int.
		2001	TBC	Serves new pair of bus stops opposite Blk 761 and opposite Baywater along Bedok North Ave 3.
Template:SBS Transit (Current)		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
		2003	16 March	Amended to ply Eunos Rd 5 and Eunos Rd 8 with the partial closure of Paya Lebar Rd to facilitate the construction of Paya Lebar MRT station on the Circle MRT Line.
			23 March	Amended to ply Tampines St 45, St 34 and St 32.
		2006	TBC	Skips a pair of abolished bus stops outside and opposite Bedok Green Sec Sch along Bedok North Ave 3.
		2009	8 March	Skips a pair of bus stops outside and opposite Bartley Sec Sch with the realignment of the junction of Upp Paya Lebar Rd and Bartley Rd.
			23 August	Amended to ply the reinstated Paya Lebar Rd, skipping Eunos Rd 5 and Eunos Rd 8.
		2010	13 February	Serves new pair of bus stops outside and opposite Blk 220 CP along Bedok North Ave 3.
		2015	28 September	Designated wheelchair-accessible bus service (WAB).

Service 29

Operator	Year	Date	Service changes
	1985	9 June	Introduced between Tampines Ter and Changi Airport Cargo Complex (Loop).
	1987	26 April	Integrated with Services 210 and 218 and amended to ply Cranwell Rd, Netheravon Rd and Changi Village Rd.
		29 November	Amended to Tampines Int.
	1992	29 November	Amended to loop at Changi Village Ter after 1930 hours daily under TransitLink Network Integration Exercise Phase 10.
	1993	TBC	Amended to loop at Changi Village Ter permanently.
Template:SBS Transit (Current)	2002	TBC	Serves new pair of bus stops outside and opposite Changi Chapel Museum along Upp Changi Rd North.
	2003	23 March	Amended to ply Tampines St 41 and Ave 9.
	2010	28 February	Designated wheelchair-accessible bus service (WAB).

Service 29A

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2013	4 March	Introduced as a short-trip service from Tampines Int to Tampines Ave 7 (Blk 497D) during evening peak hours on weekdays. Wheelchair-accessible at launch.

Service 30

Operator	Year	Date	Service changes
	1974	3 February	Re-numbered from Service 30/30A as a service between Chai Chee Ter and Jln Ahmad Ibrahim Ter.
		8 December	Amended to ply the extended Robinson Rd, skipping Market St.
	1976	15 February	Serves new staggered bus stop outside Overseas Union Finance along Robinson Rd.
	1978	1 June	Extended to Jurong Int.
	1979	11 February	Amended to ply the extended Shenton Way towards Jurong Int, skipping Parsi Rd and Anson Rd.
		25 February	Amended to Bedok Int.
		14 October	Amended to ply Still Rd and Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way traffic, skipping Telok Kurau Rd.
		TBC	Amended to ply Sims Ave/Geylang Rd and Tg Katong Rd, skipping Telok Kurau Rd/Still Rd, Joo Chiat Pl and Joo Chiat Rd.
	1981	11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
	1982	24 May	Amended to ply West Coast Highway.
	1988	3 January	Serves new staggered bus stop opposite Treasury Bldg along Shenton Way, skipping the bus stop opposite Marina House.
	1990	1 July	Extended to Boon Lay Int and amended to ply Teban Gardens Rd towards Boon Lay Int.
	1992	28 June	Amended to ply Mountbatten Rd, Fort Rd and ECP under TransitLink Network Integration Exercise Phase 8, skipping Nicoll Highway and Shenton Way.
	1996	TBC	Skips a pair of abolished bus stops outside and opposite MOE Water Works along Jln Ahmad Ibrahim.
	1999	TBC	Serves new pair of bus stops outside and opposite West Bay Resort Condo along West Coast Rd.
	2001	TBC	Amended to ply West Coast Rd and Penjuru Rd with the partial closure of Teban Gardens Rd.
Template:SBS Transit (Current)	2002	TBC	Skips abolished bus stop opposite ITE Pasir Panjang along Telok Blangah Rd.
	2003	16 March	Amended to ply Geylang Rd, Paya Lebar Rd and Sims Ave with the partial closure of Tg Katong Rd to facilitate the construction of Paya Lebar MRT station on the Circle MRT Line.
		TBC	Serves new bus stop outside Shell Kiosk along Tg Katong Rd.
	2006	19 March	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 of Dakota MRT station on the Circle MRT Line.
		18 June	Amended to Boon Lay Temp Int.
		29 October	Serves new bus stop outside VivoCity along Telok Blangah Rd.
	2008	7 December	Skips abolished bus stop opposite Temenggong D Mosque along Telok Blangah Rd.
		29 December	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Cassia Link, Guillemard Rd and Guillemard Camp Rd.
	2009	4 October	Amended to ply the reinstated Tg Katong Rd, skipping Geylang Rd, Paya Lebar Rd and Sims Ave.
		27 December	Amended to Boon Lay Integrated Transport Hub.
	2011	19 November	Amended to Bedok Temp Int.
		3 December	Designated wheelchair-accessible bus service (WAB).
	2013	29 December	Amended to ply MCE.
	2014	30 November	Amended to Bedok Integrated Transport Hub.

Service 30/30A

Operator	Year	Date	Service changes
Singapore Traction Company	1971	11 April	Introduced between Changi Rd Ter and Prince Edward Rd Ter under 1971 Bus Reorganisation.
Associated Bus Service		6 December	Operations transferred to Associated Bus Service (ABS).
	1972	TBC	Extended to International Rd Ter.
		24 December	Amended to Jln Ahmad Ibrahim Ter.
	1973	1 July	Amended to Chai Chee Ter.
	1974	3 February	Amended to skip Stamford Rd, Waterloo St and Bras Basah Rd and re-numbered Service 30 under 1974 Bus Rationalisation.

Service 30A

Operator	Year	Date	Service changes
	2000	TBC	Introduced as a short-trip service from Bedok Int to Fort Rd (Opp Fort Gdns) during morning peak hours on weekdays.
Template:SBS Transit	2007	3 January	Withdrawn.

Service 30B

Operator	Year	Date	Service changes
Template:SBS Transit	2004	29 March	Introduced as a short-trip service from Boon Lay Int to Telok Blangah Rd (HarbourFront Stn) during morning peak hours on weekdays.
	2006	18 June	Amended to Boon Lay Temp Int.
	2009	27 December	Amended to Boon Lay Integrated Transport Hub.
	2011	TBC	Withdrawn.