History of Services 81 - 90

Service 81

Operator	Year	Date	Service changes
ABS	1971	11 April	Introduced between Upp Changi Ter and New Bridge Rd Ter under 1971 Bus Reorganisation.
	1972	18 June	Amended to ply Bendemeer Rd towards New Bridge Rd Ter with the conversion of Serangoon Rd to one-way traffic.
	1974	1 October	Serves merged bus stop outside Sri Srinivasa Perumal Tp along Serangoon Rd.
	1986	11 May	Amended to skip Kuala Loyang Rd.
		1 September	Skips a pair of abolished bus stops along Tampines Rd to facilitate the construction of TPE.
		23 December	Serves merged bus stop along the new carriageway of Tampines Rd.
	1987	6 June	Amended to the relocated New Bridge Rd Ter.
		20 September	Skips 6 pairs of abolished bus stops along Tampines Rd with the opening of TPE.
		27 September	Amended to ply the extended Eu Tong Sen St towards Upp Changi Ter to facilitate the first stage of road expansion along New Bridge Rd.
		1 November	Amended to ply Eu Tong Sen St towards Upp Changi 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.
	1988	23 October	Extended to Tampines Int.
	1989	29 January	Serves relocated bus stop opposite Sri Mariamman Tp along Sth Bridge Rd, skipping abolished bus stop opposite Jamae Mque.
		30 July	Amended to ply Loyang Ave, Pasir Ris Dr 1 and Elias Rd, skipping Tampines Expressway (TPE).
		28 August	Serves new pair of bus stops outside and opposite Pasir Ris Gdns along Elias Rd.
	1993	11 April	Amended to ply Victoria St, Hill St and New Bridge Rd, skipping Nth Bridge Rd, Sth Bridge Rd and Neil Rd.
	1994	TBC	First bus from Tampines Int brought forward to 0530 hrs on weekdays.
	1996	3 September	Amended to ply Pasir Ris Dr 12 and Pasir Ris Dr 1, skipping Elias Rd.
	1997	7 December	Amended to ply Upp Pickering St, Sth Bridge Rd and Kreta Ayer Rd with the partial closure of New Bridge Rd to facilitate the construction of Chinatown MRT station on the North East MRT Line.
	1999	10 July	Amended to ply Middle Rd and Victoria St, skipping Waterloo St, Stamford Rd and Bras Basah Rd.
Template:SBS Transit (Current)	2002	20 April	Amended back to ply the reinstated New Bridge Rd, skipping Upp Pickering St, Sth Bridge Rd and Kreta Ayer Rd.
		TBC	Serves new pair of bus stops after Sommerville Rd and after Sunshine Lodge along Upp Serangoon Rd.
	2003	20 June	Serves new pair of bus stops outside Potong Pasir Stn along Upp Serangoon Rd.
		27 July	Shortened to Serangoon Int and amended to ply Hougang Ave 3 and Upp Serangoon Rd under North East MRT Line Rationalisation Phase 2.
	2007	23 June	Amended to ply Tampines Svc Rd.
	2011	3 September	Amended to loop at Serangoon Ctrl with the opening of Serangoon Integrated Transport Hub.
	2012	29 April	Serves new bus stop outside Blk 612 along Pasir Ris Dr 1.
	2017	21 August	Designated wheelchair-accessible bus service (WAB).
	2022	30 October	Temporarily amended to ply Pasir Ris St 11 and Pasir Ris St 12 with the partial closure of Pasir Ris Dr 1 to facilitate the construction of Pasir Ris East MRT station on the Cross Island MRT Line.
	2023	8 October	To be temporarily amended to ply Pasir Ris Ctrl and Pasir Ris Dr 8 with the partial closure of Pasir Ris Dr 1 to facilitate the construction of Pasir Ris MRT station on the Cross Island MRT Line.

Service 81A (1971 - 1974)

Operator	Year	Date	Service changes
ABS	1971	11 April	Introduced between Upp Serangoon Rd 10.5 km Ter and New Bridge Rd Ter under 1971 Bus Reorganisation.
	1972	18 June	Amended to ply Bendemeer Rd towards New Bridge Rd Ter with the conversion of Serangoon Rd to one-way traffic.
	1974	3 February	Amended to skip Jln Besar, Bencoolen St and Bras Basah Rd and re-numbered Service 85 under 1974 Bus Rationalisation.

Service 82

Operator	Year	Date	Service changes
ABS	1971	11 April	Introduced between Punggol Ter and Prince Edward Ter under 1971 Bus Reorganisation.
	1972	18 June	Amended to ply Bendemeer Rd towards Prince Edward Ter with the conversion of Serangoon Rd to one-way traffic.
	1974	8 December	Amended to ply the extended Robinson Rd, skipping Market St.
	1976	15 February	Serves new staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
		14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
	1978	15 January	Amended to ply Jln Sultan, skipping Sumbawa Rd.
	1979	11 February	Amended to ply the extended Shenton Way, Palmer Rd and Anson Rd, skipping Parsi Rd.
	1987	28 June	Amended to Shenton Way Ter.
	1990	24 June	Serves additional bus stop opposite Hong Wen Sch along Victoria St.
	1992	29 March	Amended to ply Hougang Ave 10 and Hougang Ave 2 under TransitLink Network Integration Exercise Phase 6, skipping Hougang Ave 8.
	1994	3 July	Amended to ply Crawford St towards Punggol Ter.
	1995	17 December	Operations transferred to TIBS.
	1998	TBC	Skips 2 pairs of abolished bus stops outside and opposite Punggol Mkt and opposite and after Lor Cheng Lim along Punggol Rd.
	1999	29 August	Operations transferred to SBS.
			First bus from Shenton Way Ter brought forward to 0545 hrs on weekdays and Saturdays, and 0600 hrs on Sundays and Public Holidays.
		TBC	Skips abolished bus stop opposite St. Anne's Ch along Punggol Rd.
		TBC	Serves reinstated bus stop outside Blk 298A along Punggol Rd.
	2000	TBC	Serves new bus stop after Shenton Way along Palmer Rd.
		10 June	Serves reinstated bus stop outside Blk 190C along Punggol Rd.
Template:SBS Transit	2002	TBC	Calls at a new pair of bus stops after Sommerville Rd and after Sunshine Lodge along Upp Serangoon Rd.
	2003	20 June	Serves new pair of bus stops outside Potong Pasir Stn along Upp Serangoon Rd.
		TBC	Skips temporarily abolished bus stop opposite Punggol Port Rd along Punggol Rd.
		7 December	Amended to start from Serangoon Int, loop at Punggol Rd and amended to ply Punggol Field, Punggol Pl and Punggol Ctrl under North East MRT Line Rationalisation Phase 3.
	2010	5 December	Serves reinstated bus stop outside Blk 604A along Punggol Rd.
	2011	3 September	Amended to start from Punggol Temp Int and loop at Serangoon Ctrl with the opening of Serangoon Integrated Transport Hub.
	2013	31 March	Designated wheelchair-accessible bus service (WAB).
(Current)	2016	4 September	Operations transferred to Go-Ahead Singapore.
			First bus brought forward to 0515 hrs daily.

Short Trip 82A (2003 - 2011)

Operator	Year	Date	Service changes
Template:SBS Transit	2003	7 December	Introduced from Serangoon Int to Punggol Rd (Punggol Rd End), operating after the last bus of Service 82 daily.
	2004	TBC	Shortened to terminate at Punggol Ctrl (Opp Blk 293). Last bus extended to 0020 hrs daily.
	2011	3 September	Discontinued with the route amendment of Service 82 to Punggol Temp Int.

Service 83 (1971 - 1992)

Operator	Year	Date	Service changes
ABS	1971	11 April	Introduced between Punggol Ter and New Bridge Rd Ter under 1971 Bus Reorganisation.
	1972	18 June	Amended to ply Bendemeer Rd towards New Bridge Rd Ter with the conversion of Serangoon Rd to one-way traffic.
	1974	1 October	Serves merged bus stop outside Sri Srinivasa Perumal Tp along Serangoon Rd.
	1987	6 June	Amended to the relocated New Bridge Rd Ter.
		27 September	Amended to ply the extended Eu Tong Sen St towards Punggol Rd Ter to facilitate the first stage of road expansion along New Bridge Rd.
		1 November	Amended to ply Eu Tong Sen St towards Punggol Rd 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.
	1988	20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
	1990	2 September	Integrated with Service 101 and amended to ply Hougang Ave 8, Hougang Ave 2, Yio Chu Kang Lk, Yio Chu Kang Rd and Serangoon Ctrl.
	1992	29 March	Integrated with Service 147 and discontinued under TransitLink Network Integration Exercise Phase 6.

Service 83 (since 2001)

Operator	Year	Date	Service changes
Template:SBS Transit	2001	23 December	Introduced between Sengkang Temp Int and Punggol Field (Loop).
	2003	18 January	Amended to Sengkang Integrated Transport Hub.
		9 February	Amended to ply Sengkang East Rd and Compassvale St, skipping Compassvale Rd.
		4 May	Amended to loop at Edgedale Plains temporarily.
		20 June	Extended to loop at Punggol Ctrl with the opening of Punggol MRT station on the North East MRT Line.
		30 November	Amended to start from Punggol Temp Int and loop at Sengkang Int.
	2014	29 June	Designated wheelchair-accessible bus service (WAB).
(Current)	2016	4 September	Operations transferred to Go-Ahead Singapore.
			First bus brought forward to 0520 hrs daily.

Short Trip 83A (2003 - 2011)

Operator	Year	Date	Service changes
Template:SBS Transit	2003	30 November	Introduced from Punggol Temp Int to Sengkang Int, operating after the last bus of Service 83 daily.
	2011	TBC	Terminating trips at Sengkang Int re-numbered as Service 83.

Service 84 (1971 - 1999)

Operator	Year	Date	Service changes
ABS	1971	3 July	Introduced between Upp Serangoon Ter and Upp Cross St (Loop).
	1974	3 February	Extended to Tg Pagar Ter under 1974 Bus Rationalisation.
	1975	2 March	Amended to ply Sims Ave towards Upp Serangoon Ter with the conversion of Geylang Rd to one-way traffic.
	1979	1 August	Amended to temporary terminal at Lim Teck Kim Rd with the closure of Tg Pagar Ter.
	1980	20 January	Amended to ply Hoe Chiang Rd towards Tg Pagar Ter, skipping Lim Teck Kim Rd
	1982	13 June	Amended to ply Aljunied Way and Aljunied Rd.
	1985	13 January	Extended to World Trade Ctr Ter.
	1987	27 September	Amended to ply the extended Eu Tong Sen St towards Upp Serangoon Ter to facilitate the first stage of road expansion along New Bridge Rd.
		1 November	Amended to ply Eu Tong Sen St towards Upp Serangoon 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.
	1990	22 July	Serves additional bus stop outside Ellenborough Mkt along Eu Tong Sen St.
	1994	17 December	Amended to Hougang Ctrl Int.
	1996	TBC	Serves additional bus stop outside Kallang Stn along Sims Ave.
	1998	24 May	Amended to Hougang Ctrl Temp Int.
	1999	12 December	Integrated with Service 864 to form Service 80 and discontinued.

Service 84 (2003 - 2005)

Operator	Year	Date	Service changes
Template:SBS Transit	2003	15 September	Introduced between Punggol Ctrl (Punggol Stn) and Punggol East (Loop) as a peak hour one-directional service, operating on weekdays and Saturdays only.
		30 November	Amended to Punggol Temp Int.
	2005	12 March	Discontinued under Punggol East LRT Rationalisation.

Service 84 (since 2011)

Operator	Year	Date	Service changes
Template:SBS Transit	2011	3 September	Introduced between Punggol Temp Int and Punggol Rd (Loop), replacing the deleted sectors of Service 82.
(Current)	2016	4 September	Operations transferred to Go-Ahead Singapore.
	2017	16 July	Designated wheelchair-accessible bus service (WAB).
	2018	26 August	Amended to ply Punggol Dr, Sentul Cres, Sumang Lk and Punggol Way with the partial closure of Punggol Rd.
	2020	23 February	Amended to ply Northshore Cres and Northshore Dr with the partial closure of Punggol Way and Punggol Rd.

Service 85 (1974 - 1991)

Operator	Year	Date	Service changes
	1974	3 February	Re-numbered from Service 81A as a service between Upp Serangoon Rd 10.5 km Ter and New Bridge Rd Ter under 1974 Bus Rationalisation.
	1977	31 January	Amended to ply Jln Kolam Ayer and Kallang Bahru and shortened to loop at Sims Ave.
	1982	19 June	Amended to ply Bendemeer Rd and Geylang Bahru, skipping Jln Kolam Ayer.
	1983	30 October	Amended to Hougang Int.
	1991	6 January	Discontinued under TransitLink Network Integration Exercise Phase 1.

Service 85 (1999 - 2003)

Operator	Year	Date	Service changes
	1999	5 December	Re-numbered from Service 865 as a service between Sengkang Ter and World Trade Ctr Ter.
	2001	28 April	Amended to Sengkang Temp Int.
Template:SBS Transit	2002	7 July	Skips the bus stop opposite Mandarin Singapore along Orchard Rd.
		TBC	Serves new pair of bus stops after Sommerville Rd and after Sunshine Lodge along Upp Serangoon Rd.
	2003	18 January	Amended to Sengkang Integrated Transport Hub.
		20 June	Serves new pair of bus stops outside Potong Pasir Stn along Upp Serangoon Rd.
		27 July	Discontinued under North East MRT Line Rationalisation Phase 2.

Service 85 (since 2006)

Operator	Year	Date	Service changes
Template:SBS Transit	2006	1 January	Introduced between Punggol Temp Int and Yishun Int.
	2010	23 May	Amended to ply Sengkang East Way, Sengkang West Way and Jln Kayu, except during weekday morning peak hours towards Yishun Int.
	2011	31 July	Serves 3 new pairs of bus stops along Sengkang West Way.
	2012	19 November	Amended to ply Sengkang East Way, Sengkang West Way and Jln Kayu permanently.
	2013	9 June	Designated wheelchair-accessible bus service (WAB).
	2015	14 March	Amended to Yishun Temp Int.
(Current)	2016	4 September	Operations transferred to Go-Ahead Singapore.
			First bus from Punggol Temp Int brought forward to 0530 hrs on weekdays.
		25 September	Serves new pair of bus stops outside Waterwoods and after Punggol Field along Punggol East.
	2019	8 September	Amended to Yishun Integrated Transport Hub.

Service 85# (2010 - 2012)

Operator	Year	Date	Service changes
Template:SBS Transit	2010	23 May	Introduced between Punggol Temp Int and Yishun Int, plying the original route of Service 85 via Sengkang East Rd during weekday morning peak hours.
	2012	19 November	Discontinued with the permanent route amendment of Service 85 to Sengkang East Way, Sengkang West Way and Jln Kayu.

Short Trip 85A (2000 - 2003)

Operator	Year	Date	Service changes
	2000	TBC	Introduced from Sengkang Ter to Upp Serangoon Rd (Blk 205) during morning peak hours on weekdays.
	2001	28 April	Amended to Sengkang Temp Int.
Template:SBS Transit	2003	18 January	Amended to Sengkang Integrated Transport Hub.
		27 July	Discontinued under North East MRT Line Rationalisation Phase 2.

Short Trip 85A (since 2019)

Operator	Year	Date	Service changes
(Current)	2019	25 March	Introduced from Yishun Temp Int to Sengkang East Rd (Sengkang Community Hub) during evening peak hours on weekdays. Wheelchair-accessible at launch.
		8 September	Amended to Yishun Integrated Transport Hub.

Short Trip 85B (2000 - 2003)

Operator	Year	Date	Service changes
	2000	TBC	Introduced from Sengkang Ter to Jln Besar (Bef Sim Lim Twr) on Saturdays, Sundays and Public Holidays.
	2001	28 April	Amended to Sengkang Temp Int.
Template:SBS Transit	2002	TBC	Serves new bus stop after Sunshine Lodge along Upp Serangoon Rd.
	2003	18 January	Amended to Sengkang Integrated Transport Hub.
		20 June	Serves new bus stop outside Potong Pasir Stn along Upp Serangoon Rd.
		27 July	Discontinued under North East MRT Line Rationalisation Phase 2.

Service 86 (1977 - 1983)

Operator	Year	Date	Service changes
	1977	13 June	Introduced between Tampines Way Ter and Shenton Way (Loop) as a semi-express service operating on weekdays and Saturdays only.
	1979	11 February	Amended to ply the extended Shenton Way, Keppel Rd and Anson Rd, skipping Parsi Rd.
	1981	11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
	1983	30 October	Amended to Hougang Int.
		18 December	Integrated with Service 97 and discontinued.

Service 86 (since 1999)

Operator	Year	Date	Service changes
	1999	5 December	Re-numbered from Service 866 as a service between Sengkang Ter and Ang Mo Kio Int.
	2000	10 June	Serves reinstated bus stop outside Blk 190C along Punggol Rd.
	2001	28 April	Amended to Sengkang Temp Int.
			First bus from Sengkang Temp Int brought forward to 0530 hrs on Saturdays, Sundays & Public Holidays.
Template:SBS Transit (Current)	2002	24 March	Amended to Ang Mo Kio Temp Int.
		TBC	Serves reinstated pair of bus stops before and after Sengkang West Ave along Jln Kayu.
	2003	18 January	Amended to Sengkang Integrated Transport Hub.
		9 February	Amended to ply Compassvale Dr, skipping Punggol Rd and Sengkang East Ave.
	2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
	2010	2 December	Designated wheelchair-accessible bus service (WAB).
	2013	13 October	Amended to ply Sengkang West Ave and Sengkang West Rd with the partial closure of Jln Kayu.

Short Trip 86A (2002 - 2010)

Operator	Year	Date	Service changes
Template:SBS Transit	2002	TBC	Introduced from Ang Mo Kio Temp Int to Jln Kayu (Bef Seletar Camp G) during morning peak hours on weekdays.
	2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
	2010	TBC	Discontinued.

Service 87

Operator	Year	Date	Service changes
	1999	19 September	Introduced between Sengkang Ter and Bedok Int.
	2001	28 April	Amended to Sengkang Temp Int.
			First bus from Sengkang Temp Int brought forward to 0530 hrs daily.
			First bus from Bedok Int brought forward to 0530 hrs daily.
Template:SBS Transit (Current)	2003	18 January	Amended to Sengkang Integrated Transport Hub.
		20 June	Serves new bus stop opposite Hougang Ctrl Int along Hougang Ctrl.
	2011	28 August	Amended to ply Jln Tenaga, Bedok Reservoir Rd and Jln Damai with the partial closure of Kaki Bt Ave 1 to facilitate the construction of Kaki Bt MRT station on the Downtown MRT Line.
		19 November	Amended to Bedok Temp Int.
		3 December	Designated wheelchair-accessible bus service (WAB).
	2014	30 November	Amended to Bedok Integrated Transport Hub.
	2016	24 April	Amended to ply the reinstated Kaki Bt Ave 1, skipping Jln Tenaga, Bedok Reservoir Rd and Jln Damai.
	2017	21 October	Serves new bus stop outside Bedok Nth Stn along Bedok Nth Rd.
	2022	28 August	Temporarily amended to ply Hougang Ave 4 and Hougang Ave 10 with the partial closure of Hougang Ctrl to facilitate the construction of Hougang MRT station on the Cross Island MRT Line.

Service 88

Operator	Year	Date	Service changes
	1999	28 February	Introduced between Pasir Ris Int and Toa Payoh Temp Int.
		TBC	Skips abolished bus stop opposite St. Anne's Ch along Punggol Rd.
		TBC	Serves reinstated bus stop outside Blk 298A along Punggol Rd.
	2000	10 June	Serves reinstated bus stop outside Blk 190C along Punggol Rd.
	2001	TBC	Last bus from Toa Payoh Temp Int extended to 2340 hrs daily.
Template:SBS Transit (Current)	2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
	2005	TBC	Skips abolished bus stop outside Muhajirin Mque along Braddell Rd.
	2013	9 June	Designated wheelchair-accessible bus service (WAB).
	2014	24 August	Serves new pair of bus stops before and after Punggol Rd along TPE.

Short Trip 88A (2000 - 2004)

Operator	Year	Date	Service changes
	2000	TBC	Introduced from Punggol Rd (St. Anne's Ch) to Ang Mo Kio Ave 3 (Opp Ang Mo Kio Stn) during morning peak hours on weekdays.
Template:SBS Transit	2002	TBC	Extended to start from Punggol Rd (Blk 190C).
	2004	TBC	Discontinued.

Short Trip 88A (since 2012)

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2012	8 October	Introduced from Hougang Ave 4 (Blk 919) to Ang Mo Kio Ave 3 (Opp Ang Mo Kio Stn) during morning peak hours on weekdays.
	2013	9 April	Extended to start from Punggol Rd (Blk 190C).
		9 June	Designated wheelchair-accessible bus service (WAB).

Short Trip 88B

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2012	8 October	Introduced from Ang Mo Kio Ave 6 (Blk 207) to Ang Mo Kio Ave 5 (Bef Yio Chu Kang Rd) during morning peak hours on weekdays.
	2013	9 April	Shortened to start from Ang Mo Kio Ave 3 (Ang Mo Kio Stn).
		9 June	Designated wheelchair-accessible bus service (WAB).

Service 89

Operator	Year	Date	Service changes
	1999	5 December	Introduced between Hougang Ctrl Temp Int and Changi Airport Cargo Cplx (Loop).
	2000	10 June	Serves reinstated bus stop outside Blk 190C along Punggol Rd.
	2001	20 May	Amended back to Hougang Ctrl Int.
Template:SBS Transit (Current)	2003	TBC	Serves new pair of bus stops outside and opposite Loyang Ind Est along Loyang Ave.
	2008	TBC	Serves new bus stop outside Changi Beach CP 2 along Nicoll Dr, skipping the bus stop opposite Changi Beach CP 2.
	2012	29 April	Serves new bus stop outside Blk 612 along Pasir Ris Dr 1.
	2014	24 August	Serves new pair of bus stops before and after Punggol Rd along TPE.
	2015	22 June	Designated wheelchair-accessible bus service (WAB).
	2022	28 August	Temporarily amended to ply Hougang Ave 4 and Hougang Ave 10 with the partial closure of Hougang Ctrl to facilitate the construction of Hougang MRT station on the Cross Island MRT Line.
	2023	26 February	Temporarily amended to ply the bus-only corridor along Loyang Ave and Loyang Way with the partial closure of Loyang Ave to facilitate the construction of Loyang Viaduct and Loyang MRT station on the Cross Island MRT Line, skipping 3 pairs of bus stops along Loyang Ave.

Short Trip 89A

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2017	10 April	Introduced from Pasir Ris Dr 1 (Blk 738) to Airport Cargo Rd (AirFreight Ter Bldg) during morning peak hours on weekdays. Wheelchair-accessible at launch.
	2021	5 July	Extended to start from the bus stop after Punggol Rd along TPE.
	2023	26 February	Temporarily amended to ply the bus-only corridor along Loyang Ave and Loyang Way with the partial closure of Loyang Ave to facilitate the construction of Loyang Viaduct and Loyang MRT station on the Cross Island MRT Line, skipping 3 bus stops along Loyang Ave.

Service 90 (1971 - 1989)

Operator	Year	Date	Service changes
ABC	1971	11 April	Introduced between Jln Ang Teng Ter and Jln Bt Merah Ter under 1971 Bus Reorganisation.
		14 September	Extended to Commonwealth Ave Ter.
	1974	3 February	Amended to ply MacPherson Rd and Aljunied Rd under 1974 Bus Rationalisation, skipping Paya Lebar Rd.
	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.
		2 March	Amended to ply Sims Ave towards Jln Ang Teng Ter with the conversion of Geylang Rd to one-way traffic.
	1977	29 August	Amended to ply Holland Ave, Holland Dr and Nth Buona Vista Rd towards Commonwealth Ave Ter.
	1981	30 June	Amended to loop at Airport Rd with the closure of Jln Ang Teng Ter.
	1982	27 May	Amended to Buona Vista Ter.
	1987	6 April	Skips abolished bus stop before College Rd along Outram Rd.
		27 September	Amended to ply the extended Eu Tong Sen St towards Airport Rd to facilitate the first stage of road expansion along New Bridge 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 Upp Cross St and New Bridge Rd, skipping Neil Rd.
	1989	5 November	Discontinued.

Service 90 (since 1993)

Operator	Year	Date	Service changes
	1993	23 May	Introduced between Toa Payoh Int and Airport Rd (Loop) under TransitLink Network Integration Exercise Phase 13.
	1994	5 March	Amended to ply Kim Keat Lk and Lor 6 Toa Payoh towards Toa Payoh Int.
	1998	31 May	Amended to Toa Payoh Temp 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.
	2007	TBC	Skips abolished bus stop before Paya Lebar Rd along Airport Rd to facilitate the construction of KPE.
	2008	TBC	Serves new bus stop after Defu Lane 12 along Airport Rd.
		24 September	Skips abolished bus stop outside KB Warehouse Cplx along Airport Rd.
	2011	4 September	Amended to skip Bendemeer Rd, Whampoa Nth and Serangoon Rd towards Toa Payoh Int with the permanent closure of Whampoa North.
	2013	3 December	Designated wheelchair-accessible bus service (WAB).

Short Trip 90A

Operator	Year	Date	Service changes
	2001	TBC	Introduced from Toa Payoh Temp Int to Airport Rd (RSAF Paya Lebar) during morning peak hours on weekdays and Saturdays.
Template:SBS Transit (Current)	2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
	2005	TBC	Extended to terminate at Airport Rd (KB Warehouse Cplx).
	2007	TBC	Skips abolished bus stop before Paya Lebar Rd along Airport Rd to facilitate the construction of KPE.
	2008	TBC	Serves new bus stop after Defu Lane 12 along Airport Rd.
		24 September	Shortened to terminate at Airport Rd (Paya Lebar Air Base) with the abolition of the bus stop outside KB Warehouse Cplx.
	2013	3 December	Designated wheelchair-accessible bus service (WAB).