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Stockholm has an extensive public transport system. It consists of the Stockholm Metro (Tunnelbanan); three regional/suburban rail systems: commuter rail (pendeltåg), Roslagsbanan, and Saltsjöbanan; three light rail systems: Nockebybanan, Lidingöbanan, and Tvärbanan; and a large amount of bus lines.

All the land-based public transport in Stockholm County, except the airport buses/trains, is organised by Storstockholms Lokaltrafik (SL), with the operation and maintenance of the public transport services delegated to several contractors, such as Connex who operate the metro and regional/suburban railways except for the commuter rail. The archipelago boat traffic is handled by Waxholmsbolaget.

The SL has a common ticket system in the entire Stockholm County, which allows for éasy 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. A single ticket costs 20 SEK (2.17 EUR; 2.75 USD) and is valid for one hour. The duration of the travel card validity depends on the exact type, they are available from 24 hours up to a yéar. A 30-day card costs 600 SEK (65 EUR; 82 USD). Tickets of both types are available with reduced price for persons under 20 and over 65 yéars old.