The Taipei Metro, more commonly known as the MRT or formally as the Taipei Rapid Transit System , is a rapid transit system serving metropolitan Taipei in Taiwan. The system is built by the Department of Rapid Transit Systems, Taipei City Government (DORTS-Taipei) and  Department of Rapid Transit Systems, New Taipei City Government (DRTS-New Taipei) and operated by the Taipei Rapid Transit Corporation (TRTC). It consists of 108 stations (117 stations if transfer stations are double-counted) and 5 main routes, operating on of revenue track. The system carried an average of over 1.78 million passengers per day in December 2012.