Just sharing some infos (from
BG1980-82). Xcept svc 44, all the other numbers have been
re-used today.. (Coincidently all in the east!)
Svc 6 Bedok - North Bridge Rd
Svc 15 Marine Parade - Shenton Way
Svc 17 Changi Pt - Prince Edward Rd
Svc 19 Siglap Rd - Prince Edward Rd
Svc 21 Kg Chai Chee - C'wealth Ave
Svc 44 Chai Chee - Bt Merah
Svc 45 Chai Chee - Tg Rhu
Not all numbers are like that.
76 is a classic example. 
