CSS ROUTES IN 1975Actually in 1975, there are 11 CSS routes operated by SSB & NTUC Comfort, not 9 CSS routes.
CSS Svcs 1, 4, 6 & 11 are operated by NTUC ComfortCSS Svcs 2, 2A, 2B, 3, 3A, 3B, 5, 5A, 5B, 7, 7A-7D, 8, 8A, 8B, 9, 9A, 9B, 10, 10A & 10B are operated by SSBSSB has each svcs that operates Off-Peak, AM Peak & PM Peak, different routings from the normal route. (Eg. SVC 2 is AM Peak & Off-Peak Routes, Svc 2A & 2B are PM Peak Routes)
All route information are taken from CSS Bus Guide 1975 (RCLOS 388.41322095957 CSSBG)
All 11 routes have been completed and you might just want to take a look at the 1975 CSS routes.
CSS Routes in 1975