[2] Traffic with horse-drawn trams began in 1877 with the privately owned Stockholms Nya Spårvägsaktiebolag (lit.

[3] The city-owned AB Stockholms Spårvägar was created in 1915 with the aim to coordinate and making the two separate networks more efficient.

The opening of Västerbron in 1935 caused a major rework of the tram and bus lines when passage through Gamla Stan no longer was mandatory when travelling from Södermalm to Kungsholmen.

The company changed its name from January 1, 1967, to AB Storstockholms Lokaltrafik and is today responsible for public transport in Stockholm County.

In 1987 a new company with the name AB Stockholms Spårvägar was created by the Swedish Tramway Society to take care of the traffic on the then forthcoming Djurgårdslinjen.