page_title: Lambertseter Line
section_title: Planning
hierarchical_section_title: Lambertseter Line / History / Planning
caption_attribution_description: English: Lambertseter Line of the Oslo Metro. Norsk bokmål: Trikkelinje og t-banelinje side om side. I en overgangsperiode kjørte vanlig sporvogn og T-bane samtidig på linjen mellom Brynseng og Helsfyr. T-banevognen i dette tilfellet tilhører Lambertseterbanen, trikken kjører for Østensjøbanen.
context_page_description: The Lambertseter Line is a 5.9-kilometer line on the Oslo Metro which runs from Brynseng to Bergkrystallen. It further shares track with the Østensjø Line along the 2.5-kilometer section from Tøyen to Brynseng. The line runs through a primary residential area of Nordstrand, serving neighborhoods such as Manglerud, Ryen and Lambertseter. The line is served by Line 4 of the metro, which runs every fifteen minutes. This is supplemented by Line 1 that is extended to Bergkrystallen between 6:30 and 19 on weekdays, giving a combined frequency of eight trains per hour.
  Originally the Lambertseter Line was proposed as an extension of the now closed Simensbråten Line. Planning of a metro started in 1946 and instead of running via Ekeberg the Lambertseter Line was to run via Etterstad. Construction was tied with large-scale construction of housing along the route. As the Lambertseter Line could be completed much earlier than the metro's Common Tunnel, the Lambertseter Line was first built as part of the Oslo Tramway. Plans were approved in 1954 and the line opened on 28 April 1957.
context_section_description: The first plans to build a tramway along part of the route of the Lambertseter Line were launched by Ekebergbanen. They had opened the Ekeberg Line in 1917, which was supplemented with a branch, the 1.3-kilometer (0.81 mi) Simensbråten Line, in 1931. Ekebergbanen proposed extending the branch along the route of the Lamberseter Line between Ryen and Brattlikollen. The terminus was planned at about Munkelia. The Ekeberg og Simensbråten lines were both light rails in their own exclusive right of way. However, the final section into the city center used street lines in mixed traffic along the Gamlebyen Line. Since 1919, there had been plans to connect the Ekeberg Line with the Holmenkollen Line on the west side of town via a tunnel. Along part of the stretch, this connection was planned elevated. Due to the German occupation of Norway from 1940 to 1945, all plans and construction of tramways were halted.
  Planning of the metro commenced in 1946. A committee was appointed, who quickly that a tramway would be insufficient to handle the necessary traffic. An overground system was ruled out because of the increased estimates in traffic and an underground route was instead pursued. This part of the line would need to handle a traffic of 20,000 passengers per hour. Following the 1948 merger of the municipalities of Oslo and Aker, it was decided that the Nordstrand area in the former Aker would be opened to large-scale residential construction. Preliminary work on the line planning concluded in 1949 and instead a permanent municipal agency was established, the Planning Office For the Suburban and Underground Lines, on 15 September 1949. Instrumental in the change of magnitude was the change of was a shift in the zoning planning. There was a large housing shortage in Oslo and the region was experiencing rapid population growth. The solution was to build a series of commuter towns in Aker, which would be the basis for the traffic on the metro. Plans for both a metro and new housing were substantiated in a 1950 municipal plan.
  The basics for the metro were established in 1951, with a common segment through Enerhaugen with a terminus at Grønlands torg, to avoid having to cross Akerselva. The plans were made such that in the future the line could be extended to connect to Holmenkolbanen's western underground line at Nationalthatret. Four branches would be built, including the Grorud Line; the existing Østensjø Line would be converted to metro. The Lambertseter Line was politically approved on 3 April 1952 and the full four-line network was approved on 9 December 1954. The latter included moving the terminus to Jernbanetorget. Investments were estimated at 221 million Norwegian krone, including rolling stock. The Lambertseter Line was given a new route west of Ryen, and would connect to the Østensjø Line at Bryn. These plans were passed by the city council on 9 December 1954, and also included the construction of the Grorud Line and an extension of the Østensjø Line from Oppsal to Bøler. In February 1956, it was also decided that the Lambertseter Line would be expanded to Bergkrystallen.
caption: SM53 tram on the Østensjø Line and T1000 train on the Lambertseter Line between Helsfyr and Brynseng in 1966. For a little over a year the Lambertseter Line was a metro line, while the Østensjø Line was still a tramway.
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