Stockholm metro

The Stockholm metro () is a metro system in Stockholm in Sweden. The first line was opened in 1950. However, underground trams had been used since 1933. The system has 100 stations in use, 47 of them are underground and 53 above ground. There are three lines (Green, Red and Blue) travelling through Central Stockholm. In the year of 2013 the Stockholm metro cars totally carried 328 million passengers inside. It corresponds to approximately 898,630 passengers per day.
The long metro system is owned by the Stockholm County Council through Storstockholms Lokaltrafik (SL). The operation is currently contracted to MTR Corporation.
The Stockholm metro system has been referred to as the"world's longest art gallery", with more over 90 of the network's 100 stations being decorated with various works of art.