Storstockholms Lokaltrafik known as SL, (Greater Stockholm Local Transport) is the public transport organisation responsible for managing land-based public transport in Stockholm County, Sweden. SL oversees a network that includes the Tunnelbana metro, Pendeltåg commuter trains, buses, trams, local rail, and some ferry services. SL's network serves approximately 700,000 daily passengers and is financed through a combination of regional taxes and fare revenues.
https://en.wikipedia.org/wiki/Storstockholms_Lokaltrafik