Express 503 
Express 505 Express 518
In May 1997, Express 503 was introduced to ply one direction
between Tampines interchange and Marina Centre during the peak
hours, via Tampines Ave 4, Bedok Reservoir Rd, Nth Rd, Nth Ave 1,
Sth Rd, Sth Ave 1, Marine Parade Rd, ECP, Anson Rd, Robinson Rd,
Fullerton Rd, Empress Pl, Temasek Blvd and Ave.
In September 1999, Express 503 was re-routed and re-numbered
Express 505, a whole day loop service to ply between Pasir Ris
interchange and Jln Bt Merah/Alexandra Rd/Telok Blangah Rd
(HarbourFront), via Pasir Ris Dr 3, Dr 6, Dr 1, Loyang Ave,
Tampines Ave 7, Ave 4, Ave 5, Ave 10, Bedok Nth Rd, PIE, CTE, Jln
Bt Merah, Alexandra Rd, Telok Blangah Rd and Lower Delta Rd.
One year later, in September 2000, Express 505 was re-routed and
renumbered Express 518, to ply between Pasir Ris interchange and
Orchard Rd/Marina Centre.
