Stockholm’s metro is a 110 kilometer long metro system that serves Stockholm with suburbs.
The number of stations in use is 100, distributed on the three subsystems Green, Red and Blue line. The first tunnel, under Södermalm, was put into service by trams on 30 September 1933. In 1950, the first metro line between Slussen and Hökarängen was inaugurated and two years later the metro trains rolled between the station Kungsgatan, now called Hötorget, and the new ABC city Vällingby. The metro continued to grow in the 1960s with Bredäng (1962), Skärholmen (1968) and Tensta (1970).
