The Kolkata Metro is a rapid transit system serving the city of Kolkata in West Bengal, India. As of February 2021, it has two operational lines, a line from Dakshineswar to Kavi Subhash and a line from Salt Lake Sector V to Phoolbagan, for a total of . Four other lines are in various phases of construction. The system has a mix of underground, at-grade and elevated stations using both broad-gauge and standard-gauge tracks. Trains operate between 05:45 and 21:55 IST and the fares range from ₹5 to ₹30 (US$0.07 to US$0.40). Due to covid-19 pandemic, tickets cannot be purchased with cash. A metro smart card is essential for buying tickets.