Oslo Metro is the rapid transit system that serves Oslo and Bærum in Norway. The system is municipally owned by Sporveien and operated by the subsidiary Sporveien T-banen, which is in contract with Ruter. The metro served 85 million passengers and operated 7 million train-kilometers (4.3 train-mi) in 2013. It serves 95 stations; of which 15 are underground and 1 is built-in. In addition, 15 stations have been closed, while 4 stations on the Kolsås Line remain temporarily nonoperational since 2006 while the line is being upgraded.