DESCRIPTION
Stockholm tram was introduced in 1877 (horse tram) and it was totally electrified in 1905. Almost all tram routes were closed in 1967 due to metro (T-Bana) construction, except for Line 21/Lidingobanan and Line 12/Nockebybanan.
The current tram network consists in 3 ordinary lines (Line 7, Line 12, Line 21), one heritage/touristic tram service (Line 7N) and in 1 fast tram/LRT line (Line 22/Tvarbanan).
Line 12/Nockebybanan opened in 1914 and was extended in 1929; it currently runs from Nockeby to Alvik. Line 12 interchanges with metro (Green Line) an LRT Line 22/Tvarbanan at Alvik.
Line 21/Lidingobanan opened in 1914 as a local/suburban railways also operated by tram cars; Line 21 was legally classified as a railway till 2008, when it was reclassified as LRT/tram service. It currently runs from Ropsten (western terminal, where it interchanges with metro Red Line) to Gashaga Brygga (western terminal).
In 1985 Stockholm municipality decided to realize a museum/heritage tram line; works started in 1990, to be completed on June 1991 with the opening of the so-called Djurgardslinjen (Line 7). Djurgardslinjen was operated from Norrmalmstrong to Waldemarsudde only on certain periods of the year; it reached briefly a remarkable ridership (more than 2 millions passengers per year) suggesting to extend it towards the city centre and to transform it in an ordinary tram line. Works have been completed on June 2010, with the opening of a regular tram service from Sergels torg to Waldemarsudde (named Line 7), that shares part of the track with an heritage/museum tram service (named Line 7N: from Norrmalmstorg to Skansen).
Line 22/Tvarbanan opened in 2000 (Gullmarsplan-Liljeholmen) and it was extended in 2002 (Gullmarsplan-Sickla), 2013 (Alvik-Solna Centrum), 2014 (Solna Centrum-Solna Station) and 2017 (Sickla udde-Sickla); it currently runs from Solna Station (northern terminal) to Sickla (south-eastern terminal). Line 22 interchanges with metro Blue Line (at Sundbyberg), metro Green Line (at Alvik, Globem and Gullmarsplan) and metro Red Line (at Liljeholmen); it also interchanges with the railways network (at Solna Station, Sundbyberg, Arstaberg and Sickla). Line 22 runs ground level mostly in segregated lanes, with some sections in reserved lanes (with righ-of-way at the crossroads) or in road traffic.