It consists of the Stockholm Metro, which consist of three colour-coded main systems (green, red and blue) with seven lines; the Stockholm commuter rail which runs on the state-owned railroads on six lines; four light rail/tramway lines; the 891 mm narrow-gauge railway Roslagsbanan, on three lines in the northeastern part; the local railway Saltsjöbanan, on two lines in the southeastern part; a large number of bus lines, and the inner-city Djurgården ferry.
The overwhelming majority of the land-based public transport in Stockholm County is organized under the common umbrella of Storstockholms Lokaltrafik, an aktiebolag wholly owned by Stockholm County Council.
Since the 1990s, the operation and maintenance of the SL public transport services are contracted out to independent companies bidding for contracts, such as MTR, which operate the Metro. The archipelago boat traffic is handled by Waxholmsbolaget, which is also wholly owned by the County Council.
SL has a common ticket system in the entire Stockholm County, which allows for easy travel between different modes of transport. The tickets are of two main types, single ticket and travel cards, both allowing for unlimited travel with SL in the entire Stockholm County for the duration of the ticket validity.
