History of Express Services 501 - 521

Service 501

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	AMHougang Ctrl → Penang Rd PMAnson Rd → Hougang Ctrl	1997	5 May	Introduced between Hougang Ctrl Int and Penang Rd (AM Peak) and between Anson Rd and Hougang Ctrl Int (PM Peak) as a peak hour one-directional service on weekdays and Saturdays.
	Hougang Ctrl ↺ Penang Rd		22 December	Converted to a day service on weekdays and Saturdays, looping at Penang Rd.
	Sengkang ↺ Penang Rd	2000	10 September	Extended to Sengkang Ter.
		2001	28 April	Amended to Sengkang Temp Int.
		2003	18 January	Amended to Sengkang Integrated Transport Hub.
			27 July	Discontinued under North East Line Rationalisation Phase 2.

Service 501X

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	Hougang Ctrl ↺ Temasek Ave	1997	22 December	Introduced between Hougang Ctrl Int and Temasek Ave (Loop) as an alternate route of Service 501, operating during off peak periods on weekdays and Saturdays and throughout the day on Sundays and Public Holidays.
	Sengkang ↺ Temasek Ave	2000	10 September	Extended to Sengkang Ter.
		2001	28 April	Amended to Sengkang Temp Int.
		2003	18 January	Amended to Sengkang Integrated Transport Hub.
			27 July	Discontinued under North East Line Rationalisation Phase 2.

Service 502

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	Hougang Ctrl ↔ Boon Lay	1997	5 May	Introduced between Hougang Ctrl Int and Boon Lay Int, operating daily.
		1999	TBC	Serves additional pair of bus stops outside and opposite The Synergy along Boon Lay Way.
	Sengkang ↔ Boon Lay	2000	10 September	Extended to Sengkang Ter.
	502Sengkang ↔ Boon Lay 502ASengkang → Grange Rd		TBC	502AIntroduced from Sengkang Ter to Grange Rd (Opp Trader's Hotel), operating during the day daily.
		2001	28 April	Amended to Sengkang Temp Int.
		2002	7 July	Skips the bus stop opposite Mandarin Singapore along Orchard Rd.
		2003	18 January	Amended to Sengkang Integrated Transport Hub.
	502Boon Lay ↺ Temasek Ave 502ABoon Lay → Temasek Ave		27 July	502Shortened to loop at Temasek Ave from Boon Lay Int under North East Line Rationalisation Phase 2.
				502AAmended to start from Boon Lay Int and terminate at Temasek Ave (Opp The Ritz-Carlton) after the last bus of Service 502 daily under North East Line Rationalisation Phase 2.
				Serves additional pair of bus stops outside and opposite Holland Village along Holland Rd.
		2005	2 July	Amended to ply Grange Rd with the partial closure of Somerset Rd.
	Pioneer Rd North ↺ Temasek Ave		26 December	502Extended to start from Pioneer Rd Nth (Opp Blk 653B), amended to ply Toh Guan Rd in both directions and ply Orchard Turn, Scotts Rd, Stevens Rd, Whitley Rd, PIE and Toh Tuck Ave towards Pioneer Rd North.
				502AExtended to operate between Pioneer Rd Nth and Temasek Ave (Loop) and converted to peak hour route variant on weekdays.
		2006	18 June	Serves new pair of bus stops outside Blk 683A and outside Blk 691A CP along Jurong West Ctrl 1.
			29 October	Serves relocated bus stop outside Orchard Stn along Orchard Turn.
		2008	15 June	Serves new pair of bus stops outside Blk 670A and outside Blk 678D along Jurong West St 64.
	Soon Lee Bus Pk ↺ Temasek Ave	2009	23 February	Extended to Soon Lee Bus Pk.
	Soon Lee Bus Pk ↺ Marina Stn Rd	2010	26 April	Amended to ply Bayfront Ave, Marina Stn Rd, ECP, AYE, Clementi Ave 6 and Commonwealth Ave West, skipping Raffles Ave, Stamford Rd, Orchard Rd, Penang Rd, Somerset Rd, Orchard Turn, Scotts Rd, Stevens Rd, Whitley Rd, PIE and Toh Tuck Ave.
	Soon Lee Bus Pk ↺ Marina St	2012	14 January	Serves reinstated bus stop outside Marina Bay Stn along Marina St.
			30 September	Designated wheelchair-accessible bus service (WAB).
	Soon Lee Bus Pk ↺ Central Blvd	2013	29 December	Amended to ply Central Blvd, Shenton Way and Keppel Rd with the opening of MCE, skipping Marina Stn Rd and ECP.
	N/A	2020	8 April	Temporarily suspended due to COVID-19 Circuit Breaker measures.
	Soon Lee Bus Pk ↺ Central Blvd		2 June	Resumed normal operations.
(Current)		2024	15 September	Operations transferred to SMRT Buses.
		2025	7 December	Amended to ply Jurong West Ave 5, Jurong West St 74 with the partial closure of Jurong West St 75 to facilitate the construction of Gek Poh station on the Jurong Region Line.

Service 502A

Operator	Route	Year	Date	Service changes
	Pioneer Rd North ↺ Temasek Ave	2005	27 December	Introduced between Pioneer Rd Nth (Opp Blk 653B) and Temasek Ave (Loop) as a peak hour variant of Service 502 on weekdays, skipping Jurong West Ave 1, Jurong East Ave 1, Toh Guan Rd and Boon Lay Way.
		2006	18 June	Serves new pair of bus stops outside Blk 683A and outside Blk 691A CP along Jurong West Ctrl 1.
			29 October	Serves relocated bus stop outside Orchard Stn along Orchard Turn.
		2008	15 June	Serves new pair of bus stops outside Blk 670A and outside Blk 678D along Jurong West St 64.
	Soon Lee Bus Pk ↺ Temasek Ave	2009	23 February	Extended to Soon Lee Bus Pk.
	Soon Lee Bus Pk → Marina Stn Rd	2010	26 April	Shortened to terminate at Marina Stn Rd (Marina Bay Stn) and revised to operate during weekday morning peak hours only.
	Soon Lee Bus Pk → Marina St	2012	14 January	Serves reinstated bus stop outside Marina Bay Stn along Marina St.
			30 September	Designated wheelchair-accessible bus service (WAB).
	Soon Lee Bus Pk → Central Blvd	2013	29 December	Amended to terminate at Central Blvd (Downtown Stn) with the opening of MCE.
	N/A	2020	8 April	Temporarily suspended due to COVID-19 Circuit Breaker measures
	Soon Lee Bus Pk → Central Blvd		2 June	Resumed normal operations.
(Current)		2024	15 September	Operations transferred to SMRT Buses.

Service 502B

Operator	Route	Year	Date	Service changes
	Jurong West Ave 1 ↺ Temasek Ave	2005	27 December	Introduced between Jurong West Ave 1 (Blk 538) and Temasek Ave (Loop) as a peak hour variant of Service 502 on weekdays.
		2006	29 October	Serves relocated bus stop outside Orchard Stn along Orchard Turn.
		2010	26 April	Discontinued.

Service 503

Operator	Route	Year	Date	Service changes
	AMTampines → Temasek Ave PMAnson Rd → Tampines	1997	5 May	Introduced between Tampines Int and Temasek Ave (Opp Centennial Twr) during morning peak hours and between Anson Rd (Apex Tower) and Tampines Int during evening peak hours as a peak hour one-directional service on weekdays and Saturdays.
		1999	30 August	Extended to start from Pasir Ris Int, extended to loop at Telok Blangah Rd, converted to full day service and re-numbered as Service 505.

Service 505

Operator	Route	Year	Date	Service changes
	Pasir Ris ↺ Telok Blangah Rd	1999	30 August	Re-numbered from Service 503 as a service between Pasir Ris Int and Telok Blangah Rd (Loop), operating daily.
		2000	10 September	Shortened to loop at Temasek Ave and re-numbered as Service 518.

Service 506

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Jurong East ↔ Bedok	1999	30 August	Introduced between Jurong East Int and Bedok Int, operating daily.
	Jurong East ↔ Changi Airport	2000	10 September	Extended to Changi Airport.
				Serves additional pair of bus stops outside and opposite Trellis Twrs along Jln Toa Payoh.
				Last bus from Jurong East Int extended to 2210 hrs daily.
		2001	TBC	Serves new pair of bus stops opposite Blk 761 and opposite Baywater along Bedok Nth Ave 3.
		2002	TBC	Serves new pair of bus stops opposite and between Blks 731 and 734 along Bedok Reservoir Rd.
	Jurong East ↔ Bedok		15 September	Shortened back to Bedok Int.
				Last bus from Jurong East Int extended to 2230 hrs daily.
		2006	TBC	Skips a pair of removed bus stops outside and opposite Bedok Green Sec Sch along Bedok Nth Ave 3.
	Jurong East ↔ Upp East Coast		12 November	Extended to Upp East Coast Ter.
				Last bus from Jurong East Int reverted to 2200 hrs daily.
		2010	13 February	Serves new pair of bus stops outside and opposite Blk 220 CP along Bedok Nth Ave 3.
		2011	17 December	Amended to Jurong East Temp Int.
		2012	30 September	Designated wheelchair-accessible bus service (WAB).
		2017	23 April	Serves relocated bus stop before PIE along Bt Batok Rd.
	N/A	2020	15 April	Temporarily suspended due to COVID-19 Circuit Breaker measures.
	Jurong East ↔ Upp East Coast		2 June	Resumed normal operations.
			6 December	Amended to relocated Jurong East Temp Int.
	Jurong East ↔ Serangoon	2021	12 December	Shortened to Serangoon Int under Downtown Line Stage 3 Rationalisation.

Service 507

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	AMBoon Lay → Shenton Way PMAnson Rd → Boon Lay	1999	30 August	Introduced between Boon Lay Int and Shenton Way (Opp Temasek Twr) during morning peak hours and between Anson Rd (Intl Plaza) and Boon Lay Int during evening peak hours as a peak hour one-directional service on weekdays and Saturdays.
		2004	22 August	Discontinued.

Service 508

Operator	Route	Year	Date	Service changes
	AMSengkang → Penang Rd PMAnson Rd → Sengkang	1999	30 August	Introduced between Sengkang Ter and Penang Rd (Park Mall) during morning peak hours and between Anson Rd (Apex Twr) and Sengkang Ter during evening peak hours as a peak hour one-directional service on weekdays and Saturdays.
	AMSengkang → Penang Rd PMOutram Rd → Sengkang		22 November	Serves an additional bus stop outside Outram Pk Stn along Outram Rd and 2 additional bus stops opposite Maritime Hse and outside Southpoint along Cantonment Rd during morning peak hours.
				Extended to start from Outram Rd (Outram Pk Stn) during evening peak hours.
		2000	4 September	Shortened to Hougang Ctrl Temp Ter and re-numbered Service 511.

Service 511

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	AMHougang Ctrl Temp Int → Penang Rd PMOutram Rd → Hougang Ctrl Temp Int	2000	4 September	Re-numbered from Service 508 as a peak-hour one-directional service between Hougang Ctrl Temp Ter and Penang Rd (Park Mall) during morning peak hours and between Outram Rd (Outram Pk Stn) and Hougang Ctrl Temp Ter during evening peak hours on weekdays and Saturdays.
		2003	27 July	Discontinued under North East Line Rationalisation Phase 2.

Service 512

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	AMHougang Ctrl Temp Int → Orchard Rd PMMoulmein Rd → Hougang Ctrl Temp Int	2000	4 September	Introduced between Hougang Ctrl Temp Ter and Orchard Rd (Le Meridien Shop Ctr) during morning peak hours and between Moulmein Rd (Opp Tan Tock Seng Hosp) and Hougang Ctrl Temp Ter during evening peak hours as a peak hour one-directional service on weekdays and Saturdays.
		2002	7 July	Skips the bus stop outside Orchard Emerald along Orchard Rd.
		2003	27 July	Discontinued under North East Line Rationalisation Phase 2.

Service 513

Operator	Route	Year	Date	Service changes
(Current)	AMTampines Ave 5 → Shenton Way PMAnson Rd → Tampines Ave 5	2012	17 December	Introduced between Tampines Ave 5 (Darul Ghufran Mque) and Shenton Way (Opp MAS Bldg) during morning peak hours and between Anson Rd (Hub Synergy Pt) and Tampines Ave 5 (Opp Darul Ghufran Mque) during evening peak hours, operating 2 trips in each direction as a peak hour one-directional service on weekdays under the LTA's Bus Service Enhancement Programme (BSEP).
		2013	31 March	Designated wheelchair-accessible bus service (WAB).
			1 December	Serves new bus stop outside Downtown Stn along Central Blvd.
			30 December	Amended to ply Sheares Ave towards Shenton Way with the partial closure of ECP.
		2015	12 January	3rd AM peak trip added at 0738 hrs.
	N/A	2020	8 April	Temporarily suspended due to COVID-19 Circuit Breaker measures.
	AMTampines Ave 5 → Shenton Way PMAnson Rd → Tampines Ave 5		2 June	Resumed normal operations.

Service 518

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	Pasir Ris ↺ Temasek Ave	2000	10 September	Re-numbered from Service 505 as a service between Pasir Ris Int and Temasek Ave (Loop).
	518Pasir Ris ↺ Temasek Ave 518APasir Ris → Temasek Ave	2001	TBC	518AIntroduced from Pasir Ris Int to Temasek Ave (Opp Centennial Twr), operating during morning peak hours on weekdays.
		2002	7 July	Skips the bus stop outside Orchard Emerald along Orchard Rd.
	Pasir Ris ↺ Temasek Ave	2005	26 December	Amended to ply Pasir Ris Dr 3, Pasir Ris Dr 12 and Pasir Ris Dr 1, skipping Elias Rd.
				518AAmended to loop at Temasek Ave and converted to peak hour route variant of Service 518 on weekdays.
	Pasir Ris ↺ Bayfront Ave	2010	26 April	Amended to ply Bayfront Ave, skipping Raffles Blvd and Republic Blvd.
		2012	29 April	Serves new bus stop outside Blk 612 along Pasir Ris Dr 1.
			3 December	Designated wheelchair-accessible bus service (WAB).
(Current)		2016	18 September	Operations transferred to Go-Ahead Singapore.
			23 September	Amended to ply KPE and PIE towards Pasir Ris Int, skipping Bedok Sth Ave 1, Bedok Sth Rd and Bedok Nth Ave 1.
		2017	21 October	Serves new pair of bus stops outside Tampines East Stn along Tampines Ave 2.
				Serves new bus stop outside Bedok Nth Stn along Bedok Nth Rd.
	N/A	2020	8 April	Temporarily suspended due to COVID-19 Circuit Breaker measures.
	Pasir Ris ↺ Bayfront Ave		2 June	Resumed normal operations.
	N/A	2021	15 September	Temporarily suspended due to the impact of COVID-19 on available manpower.
	Pasir Ris ↺ Bayfront Ave		25 September	Resumed normal operations.
		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 station on the Cross Island Line.
			27 November	Serves new pair of bus stops outside and opposite HomeTeamNS Bedok along Bedok Nth Rd.
		2023	8 January	Skips the bus stop outside Newton Stn Exit B along Scotts Rd temporarily to facilitate upgrading works.
			27 August	Serves reinstated bus stop outside Newton Stn Exit B along Scotts Rd.
			8 October	Temporarily amended to ply Pasir Ris Dr 8 with the partial closure of Pasir Ris Dr 1 to facilitate the construction of Pasir Ris station on the Cross Island Line.
		2025	27 April	Amended to Pasir Ris Integrated Transport Hub.

Service 518A

Operator	Route	Year	Date	Service changes
	Pasir Ris ↺ Temasek Ave	2005	27 December	Introduced between Pasir Ris Int and Temasek Ave (Loop) as a peak hour variant of Service 518 on weekdays, skipping Tampines Ave 7, Tampines Ave 2, Tampines Ave 1, Tampines Ave 10 and Bedok North Rd.
	Pasir Ris → Bayfront Ave	2010	26 April	Shortened to terminate at Bayfront Ave (Opp Marina Bay Sands MICE) and revised to operate during weekday morning peak hours only.
		2012	29 April	Serves new bus stop outside Blk 612 along Pasir Ris Dr 1.
			3 December	Designated wheelchair-accessible bus service (WAB).
(Current)		2016	18 September	Operations transferred to Go-Ahead Singapore.
	N/A	2020	8 April	Temporarily suspended due to COVID-19 Circuit Breaker measures in Singapore until 1 June 2020.
	Pasir Ris → Bayfront Ave		2 June	Resumed normal operations.
	N/A	2021	15 September	Temporarily suspended due to the impact of COVID-19 on available manpower.
	Pasir Ris → Bayfront Ave		25 September	Resumed normal operations.
		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 station on the Cross Island Line.
			27 November	Serves new pair of bus stops outside and opposite HomeTeamNS Bedok along Bedok Nth Rd.
		2023	8 January	Skips the bus stop outside Newton Stn Exit B along Scotts Rd temporarily to facilitate upgrading works.
			27 August	Serves reinstated bus stop outside Newton Stn Exit B along Scotts Rd.
			8 October	Temporarily amended to ply Pasir Ris Dr 8 with the partial closure of Pasir Ris Dr 1 to facilitate the construction of Pasir Ris station on the Cross Island Line.
		2025	27 April	Amended to Pasir Ris Integrated Transport Hub.

Service 518B

Operator	Route	Year	Date	Service changes
	Tampines Ave 7 ↺ Temasek Ave	2005	27 December	Introduced between Tampines Ave 7 (Blk 370) and Temasek Ave (Loop) as a peak hour variant of Service 518 on weekdays.
		2010	26 April	Discontinued.

Service 520

Operator	Route	Year	Date	Service changes
	AMYishun → Outram Rd PMNew Bridge Rd → Yishun	1997	5 May	Introduced between Yishun Int and Outram Rd (Opp Outram Pk Stn) during morning peak hours and between New Bridge Rd Ter and Yishun Int during evening peak hours as a peak hour one-directional service on weekdays and Saturdays.
			7 December	Amended to ply Upp Pickering St, Sth Bridge Rd, Neil Rd and Cantonment Rd with the partial closure of New Bridge Rd to facilitate the construction of Chinatown station on the North East Line.
		2002	20 April	Amended to ply the reinstated New Bridge Rd, skipping Upp Pickering St, Sth Bridge Rd, Neil Rd and Cantonment Rd.
			TBC	Serves bus stop outside Blk 923 along Yishun Ave 2, skipping the bus stop outside Northpoint Shop Ctr.
		2003	24 August	Discontinued.

Service 521

Operator	Route	Year	Date	Service changes
	Bukit Panjang ↔ World Trade Ctr	1999	1 September	Introduced between Bt Panjang Ter and World Trade Ctr Ter, operating daily.
			26 December	Amended to Bt Panjang Int.
		2000	TBC	Serves additional pair of bus stops outside and opposite ITE Dover along AYE.
		2002	29 September	Extended to Woodlands Reg Int, amended to ply Bt Batok East Ave 4, converted to trunk service and re-numbered Service 963, skipping Cashew Road and Bt Batok East Ave 6.

See also

• History of Bus Services