It plied buses in Kolkata and nearby districts of West Bengal, along with some long-distance services.

To fulfill the demand of rural passengers, CSTC introduced one of the earliest Long Distance Bus Services (LDS) from Calcutta to Digha in April 1968.

With a fleet of 782 buses, CSTC was able to set up a number of bus routes in the southern part of West Bengal which were till then not connected to any other means of transport.

CSTC also pioneered the running of air-conditioned Volvo buses in Kolkata, replacing the aging fleet.

They were in blue and white livery, the buses included a complete fleet of Volvo 8400 units as well as JanBus models from Ashok Leyland, the first low floor front entry public buses in the country.