The Calcutta State Transport Corporation (CSTC) was a state-owned public sector road transport undertaking that operated bus services in and around the city of Kolkata (formerly Calcutta) in West Bengal, India. It functioned as one of the principal providers of urban surface transport in the Kolkata metropolitan area for several decades before being merged with other state transport bodies under a consolidated entity.
| Name | Calcutta State Transport Corporation |
|---|---|
| Abbreviation | CSTC |
| Type | State public sector undertaking (defunct) |
| Industry | Public road transport |
| Headquarters | Kolkata, West Bengal, India |
| Owner | Government of West Bengal |
| Area served | Kolkata metropolitan area |
| Status | Merged into successor state transport entity |
Public bus transport in Kolkata has historically been provided by a mix of state-run corporations and private operators. CSTC operated under the administrative control of the Transport Department, Government of West Bengal, and was tasked with running stage carriage services on city routes, suburban links, and selected long-distance corridors. The corporation operated a mixed fleet, including conventional diesel buses and, in later years, electric trolleybuses and air-conditioned coaches introduced to modernise the urban fleet.
CSTC's services were organised around depots distributed across the city, supporting routes that connected central Kolkata with suburban neighbourhoods, transit hubs such as Howrah and Sealdah railway stations, and outlying townships. The corporation also operated specialised services, including airport links and chartered services for institutional users. Tickets, timetables, and route numbers issued by CSTC were a familiar feature of the city's daily commuting landscape.
As part of a reorganisation of state transport undertakings in West Bengal, CSTC was consolidated along with other regional bodies — including the Calcutta Tramways Company and the South Bengal and North Bengal State Transport Corporations — into a unified state transport framework. The consolidation aimed at streamlining administration, optimising fleet deployment, and reducing operating losses across the constituent undertakings.
For much of its existence, CSTC was a defining element of Kolkata's public transport ecosystem, providing affordable surface mobility to a large urban population. Its operations complemented the city's tram network and, later, the Kolkata Metro, in shaping the multi-modal character of urban transport in the metropolitan region.