History of Express Services

SBS/SBS Transit

Service 501

Year	Date	Service changes
1997	5 May	Introduced between Hougang Central Int and Penang Rd (AM Peak) and between Anson Rd and Hougang Central Int (PM Peak) as a peak hour one-directional service on weekdays and Saturdays.
	22 December	Amended to loop at Penang Rd and enhanced to operate an alternate route between Hougang Central Int and Temasek Ave (loop) during evening off peak hours on weekdays and Saturdays and throughout the day on Sundays and Public Holidays.
1998	24 May	Amended to Hougang Central Temp Ter.
2000	3 September	Extended to Sengkang Ter.
2001	28 April	Amended to Sengkang Temp Int.
2003	18 January	Amended to Sengkang Integrated Transport Hub.
	28 July	Withdrawn under North East MRT Line Rationalisation Phase 2.

Service 502

Year	Date	Service changes
1997	5 May	Introduced between Hougang Central Int and Boon Lay Int.
1998	24 May	Amended to Hougang Central Temp Ter.
2000	3 September	Extended to Sengkang Ter.
2001	28 April	Amended to Sengkang Temp Int.
2003	18 January	Amended to Sengkang Integrated Transport Hub.
	27 July	Shortened to loop at Temasek Ave from Boon Lay Int under North East MRT Line Rationalisation Phase 2.
2005	2 July	Amended to ply Grange Rd with the partial closure of Somerset Rd.
	26 December	Extended to Pioneer Rd North and amended to ply Toh Guan Rd, express sectors along Commonwealth Ave West, Clementi Ave 2 and Tanglin Rd and ply Orchard Turn, Scotts Rd, express sectors along Stevens Rd, along Whitley Rd, along Pan-Island Expressway (PIE) and Toh Tuck Ave towards Pioneer Rd North.
2006	29 October	Amended to ply the extended Orchard Turn, skipping Orchard Blvd.
2009	23 February	Extended to Soon Lee Bus Park.
2010	26 April	Amended to ply Bayfront Ave, Marina Station Rd, express sectors along East Coast Parkway (ECP), Ayer Rajah Expressway (AYE), Clementi Ave 6 and Commonwealth Ave West, skipping Raffles Ave, Stamford Rd, Orchard Rd, Penang Rd, Somerset Rd, Orchard Turn, Scotts Rd, express sectors along Stevens Rd, PIE and Toh Tuck Ave.
2013	29 December	Amended to ply Central Blvd, Shenton Way and express sectors along Keppel Rd with the opening of the Marina Coastal Expressway (MCE), skipping Marina Station Rd and express sectors along ECP.

Service 502A

Year	Date	Service changes
2005	27 December	Introduced between Pioneer Rd North and Temasek Ave (loop) as a peak hour variant of Service 502 on weekdays, skipping Jurong West Ave 1, Jurong East Ave 1 and Toh Guan Rd.
2006	30 October	Amended to ply the extended Orchard Turn, skipping Orchard Blvd.
2009	23 February	Extended to Soon Lee Bus Park.
2010	26 April	Shortened to terminate at Marina Station Rd and revised to operate during weekday morning peak hours only.
2013	30 December	Amended to terminate at Central Blvd with the opening of the Marina Coastal Expressway (MCE).

Service 502B

Year	Date	Service changes
2005	27 December	Introduced between Jurong West Ave 1 and Temasek Ave (loop) as a peak hour variant of Service 502, skipping Pioneer Rd North, Jurong West Ave 5, Jurong West St 75, Jurong West St 64, Jurong West Central 1 and Boon Lay Ave.
2006	30 October	Amended to ply the extended Orchard Turn, skipping Orchard Blvd.
2010	26 April	Withdrawn.

Service 503

Year	Date	Service changes
1997	5 May	Introduced between Tampines Int and Temasek Ave (AM Peak) and between Anson Rd and Tampines Int (PM Peak) as a peak hour one-directional service on weekdays and Saturdays.
1999	TBC	Extended to start from Pasir Ris Int, extended to loop at Telok Blangah Rd, converted to full day service and re-numbered Service 505. (Related change)

Service 505

Year	Date	Service changes
1999	TBC	Re-numbered from Service 503 as a service between Pasir Ris Int and Telok Blangah Rd (loop). (Related change)
2000	3 September	Shortened to loop at Temasek Ave and re-numbered Service 518. (Related change)

Service 506

Year	Date	Service changes
1998	TBC	Introduced between Jurong East Int and Bedok Int.
2000	3 September	Extended to Changi Airport.
2002	15 September	Shortened back to Bedok Int.
2006	12 November	Extended to Upp East Coast Ter.
2011	17 December	Amended to Jurong East Temp Int.

Service 507

Year	Date	Service changes
1998	TBC	Introduced between Boon Lay Int and Shenton Way (AM Peak) and between Anson Rd and Boon Lay Int (PM Peak) as a peak hour one-directional service on weekdays and Saturdays.
2004	23 August	Withdrawn.

Service 508

Year	Date	Service changes
1999	TBC	Introduced between Sengkang Ter and Penang Rd (AM Peak) and between Outram Rd and Sengkang Ter (PM Peak) as a peak hour one-directional service on weekdays and Saturdays.
2000	4 September	Shortened to Hougang Central Temp Ter with the route extension of Service 501. At the same time, re-numbered Service 511. (Related change)

Service 511

Year	Date	Service changes
2000	4 September	Re-numbered from Service 508 as a peak-hour one-directional service between Hougang Central Temp Ter and Penang Rd (AM Peak) and between Outram Rd and Hougang Central Temp Ter (PM Peak). (Related change)
2001	21 May	Amended to Hougang Central Int.
2003	28 July	Withdrawn under North East MRT Line Rationalisation Phase 2.

Service 512

Year	Date	Service changes
2000	4 September	Introduced between Hougang Central Temp Ter and Orchard Rd (AM Peak) and between Moulmein Rd and Hougang Central Temp Ter (PM Peak).
2001	21 May	Amended to Hougang Central Int.
2003	28 July	Withdrawn under North East MRT Line Rationalisation Phase 2.

Service 513

Year	Date	Service changes
2012	17 December	Introduced between Tampines Ave 5 and Shenton Way (AM Peak) and between Anson Rd and Tampines Ave 5 (PM Peak) as a peak hour one-directional service on weekdays under the LTA's Bus Service Enhancement Programme (BSEP).
2013	30 December	Amended to ply express sectors along Sheares Ave for AM peak trips with the partial closure of East Coast Parkway (ECP).
2015	12 January	An additional trip at 0738 hours was introduced.

Service 518

Year	Date	Service changes
2000	3 September	Re-numbered from Service 505 as a service between Pasir Ris Int and Temasek Ave (loop). (Related change)
2005	26 December	Amended to ply Pasir Ris Dr 12, skipping Elias Rd.
2010	26 April	Amended to ply Bayfront Ave, skipping express sectors along Raffles Blvd and Republic Blvd.

Service 518A

Year	Date	Service changes
2005	27 December	Introduced between Pasir Ris Int and Temasek Ave (loop) as a peak hour variant of Service 518, skipping Tampines Ave 7, Tampines Ave 2, Tampines Ave 1 and Bedok North Rd.
2010	26 April	Shortened to terminate at Bayfront Ave and revised to operate during weekday morning peak hours only.

Service 518B

Year	Date	Service changes
2005	27 December	Introduced between Tampines Ave 7 and Temasek Ave (loop) as a peak hour variant of Service 518, skipping Pasir Ris Int, Pasir Ris Dr 3, Pasir Ris Dr 12, Pasir Ris Dr 1 and Loyang Ave.
2010	26 April	Withdrawn.

TIBS/SMRT

Service 188E

Year	Date	Service changes
2007	25 June	Introduced between Choa Chu Kang Int and HarbourFront Int as a peak hour one-directional service on weekday mornings.

Service 188R

Year	Date	Service changes
2010	1 May	Introduced between Choa Chu Kang and Resorts World Sentosa, operating on Saturdays, Sundays and Public Holidays only.

Service 520

Year	Date	Service changes
1997	5 May	Introduced between Yishun Int and Outram Rd (AM Peak) and between New Bridge Rd Ter and Yishun Int (PM Peak) as a peak hour one-directional service on weekdays and Saturdays.
2002	TBC	Amended to ply the reinstated New Bridge Rd, skipping South Bridge Rd and Neil Rd.
2003	25 August	Withdrawn.

Service 521

Year	Date	Service changes
1999	1 September	Introduced between Bt Panjang Ter and World Trade Ctr Ter.
	26 December	Amended to Bt Panjang Int.
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. (Related change)

Service 850E

Year	Date	Service changes
2013	18 February	Introduced between Yishun Ave 11 and Shenton Way (AM Peak) and between Anson Rd and Yishun Ave 11 (PM Peak) as a peak hour one-directional service on weekdays under the LTA's Bus Service Enhancement Programme (BSEP).
2015	28 September	Amended to start from Yishun St 41 for AM peak trips, terminate at Yishun Ring Rd for PM peak trips and amended to ply Yishun Ave 1 with the introduction of City Direct Service 663, skipping Yishun Ave 6, Yishun St 31 and Yishun Ring Rd.

Service 854E

Year	Date	Service changes
2007	9 April	Introduced between Yishun Int and Bedok Int as a peak hour one-directional service during weekday mornings.
2011	21 November	Amended to terminate at Bedok Temp Int.
2014	1 December	Amended to terminate at Bedok Integrated Transport Hub.
2015	16 March	Amended to start from Yishun Temp Int.

Service 868

Year	Date	Service changes
2010	28 September	Introduced between Bt Batok West Ave 5 and Temasek Ave as a peak hour one-directional service during weekday mornings.

Service 951E

Year	Date	Service changes
2013	17 June	Introduced between Woodlands St 82 and Shenton Way (AM Peak) and between Anson Rd and Woodlands St 82 (PM Peak) as a peak hour one-directional service on weekdays under the LTA's Bus Service Enhancement Programme (BSEP).
2015	12 October	Amended to ply Woodlands Ave 5 with the introduction of City Direct Service 665, skipping Woodlands Ave 1.

Service 963E

Year	Date	Service changes
2006	20 February	Introduced between Woodlands Reg Int and HarbourFront Int as a peak hour one-directional service during weekday mornings.
2009	11 May	Enhanced to operate between HarbourFront Int and Woodlands Reg Int during weekday evenings.
2016	14 March	Amended to Woodlands Temp Int.

Service 963R

Year	Date	Service changes
2010	30 January	Introduced between Woodlands Reg Int and Resorts World Sentosa, operating on Saturdays, Sundays and Public Holidays only.
2016	12 March	Amended to Woodlands Temp Int.

Service 971E

Year	Date	Service changes
2011	14 March	Introduced between Bt Panjang Int and Cecil St as a peak hour one-directional service during weekday mornings.
	29 August	Enhanced to operate between Anson Rd and Bt Panjang Int during weekday evenings.
2012	17 December	Amended to start and terminate at Jelebu Rd with the closure of Bt Panjang Int.

Service 982E

Year	Date	Service changes
2013	18 March	Introduced between Choa Chu Kang Ave 5 and Marina Blvd (AM Peak) and between Central Blvd and Choa Chu Kang Ave 5 (PM Peak) as a peak hour one-directional service on weekdays under the LTA's Bus Service Enhancement Programme (BSEP).
2015	27 April	Extended to start from and terminate at the extended Choa Chu Kang Ave 5.

Tower Transit

Service 97e

Year	Date	Service changes
2016	13 June	Handed over to Tower Transit as a service between Jurong East Temp Int and Marina Ctr Ter (AM Peak) and between Marina Ctr Ter and Jurong East Temp Int (PM Peak). (Related change)