Calcutta State Transport Corporation (Bengali: কলকাতা রাষ্ট্রীয় পরিবহণ সংস্থা, CSTC) is a West Bengalstate governmentundertaken transport corporation. Headquartered in Kolkata it was set up on 31 July 1948. It plies buses in Kolkata and the nearby districts of West Bengal with some long distance services. CSTC owns 11 depots in Kolkata and some more outside in the districts to station .
Calcutta State Transport Corporation started its journey on 31 July 1948 as State Transport Services with an objective to provide efficient, adequate, economical and properly coordinated passenger bus service particularly in and around the city of Kolkata and in the state of West Bengal in general. On 15 June 1960 the name of State Transport Service has changed to Calcutta State Transport Corporation(CSTC) under the Road Transport Corporation Act, 1950.
By 1966-67, CSTC upgraded its service and connects 90 percent of the national highways. To fulfil the demand of rural passengers, CSTC introduced a Long Distance Bus Service (LDS) from Calcutta to Digha in April 1968.
As the part of its expansion programme CSTC was able to set up number of bus routes in the southern part of the West Bengal which were not connected to any means of transport. Apart from this, CSTC is operating a huge fleet of buses in the northern part of the Kolkata, adjoining Calcutta to Siliguri, Calcutta to Malda, Calcutta to Raigunge, Calcutta to Balurghat, Calcutta to Farakka, Calcutta to Khajuria-Ghat.