The Tianjin Metro is the current rapid transit system in the city of Tianjin, which was the second city (after Beijing) in China to operate a subway system. Opened in 1984, the system now has 4 operating lines and 86 stations spanning over a total of 132.4 km. The lines are jointly operated by two rapid transit companies, namely the Tianjin Metro Group Co. Ltd and the Binhai Mass Transit Development Co. Ltd. The former mainly operates lines in the downtown, while the latter operates lines that serve the Binhai New Area and TEDA.