Kolkata Metro
Updated: Wikipedia source
The Kolkata Metro is a rapid transit system serving the city of Kolkata and the Kolkata Metropolitan Region in West Bengal, India. Opened in 1984, it is the first and oldest operational rapid transit system in India. It has 5 color-coded lines with 58 operational stations with a total length of 73.42 km (45.62 mi), making it India's fourth largest and fourth busiest metro rail system. The system has a mix of underground, at-grade, and elevated stations using both broad-gauge and standard-gauge tracks. It operates on a 750 V DC Third rail system. Trains operate between 06:30 and 22:44 IST. The Kolkata Metro was initially planned in the 1920s, but construction started in the 1970s. The first underground stretch, from Bhawanipore (now Netaji Bhawan) to Esplanade, opened in 1984. A truncated section of Green Line, or the East–West Corridor, from Salt Lake Sector V to Howrah Maidan, was opened in 2020. Purple Line, or the Joka–Eden Gardens Corridor (currently truncated in Majerhat), opened in 2022, Orange Line, from Kavi Subhash to Beleghata, opened in 2024. The Yellow Line, from Noapara to Jai Hind, opened in 2025. As of 2025, Kolkata metro has the deepest metro station and largest underground metro station in India. Howrah metro station of Green Line is the deepest metro station in India with depth of 34 m (112 ft). Also at the time of inauguration, it was the largest metro station of India. In August 2025, Jai Hind metro station of Yellow Line became the largest metro station in India, as well as one of largest in Asia. Metro Railway, Kolkata and Kolkata Metro Rail Corporation are the owners and operator of the system. On 29 December 2010, Metro Railway, Kolkata, became the 17th zone of the Indian Railways, completely owned and funded by the Ministry of Railways. It is the only metro system in the country to be controlled entirely by Indian Railways. Around 300 daily train trips carry more than 800,000 passengers.