page_title: Furuset Line
section_title: History
hierarchical_section_title: Furuset Line / History
caption_attribution_description: English: Construction of the Furuset Line of the Oslo Metro. Norsk bokmål: Under utbyggingen av Furusetbanen, tunnel mot Trosterud. Lite hus bak til venstre het Ole Reistadsv 14, senere Lindebergåsen 33B. Boligblokk på Trosterud i bakgrunnen
context_page_description: The Furuset Line is a 5.6-kilometer long line on the Oslo Metro between Hellerud and Ellingsrudåsen in Oslo, Norway. Running mostly underground, it passes through the southern part of Groruddalen, serving neighborhoods in the boroughs of Alna and Furuset. The line is served by Line 2 of the metro with four or eight trains per hour. The line is owned by Kollektivtransportproduksjon and operated by Oslo T-banedrift on contract with Ruter using MX3000 trains.
  The section from Hellerud via Tveita to Haugerud opened in 1970. The line was extended to Trosterud in 1974, to Lindeberg and Furuset in 1978, and to Ellingsrudåsen in 1981. There are plans to extend the line further east through Lørenskog to Akershus University Hospital, and to build a branch from Furuset to the Grorud Line.
context_section_description: In 1948, the municipalities of Oslo and Aker were merged, and the new municipality started planning an expansion of the suburbs, among other places in Groruddalen. On 15 September 1949, the Planning Office For the Suburban and Underground Lines was established as a division within the new municipality. The first specific plans were launched in March 1954, and consisted of four branches, including one on the south side of Groruddalen, which would be built to Furuset. The plans originally consisted of terminus in the city center at Grønlands torg, with a possible extension to Nationaltheatret, where the line would intersect with Holmenkolbanen's light rails serving Oslo West. However, it was quickly decided that the terminus would be Jernbanetorget, which served the Oslo East Station.
  Construction of the Furuset Line, from Hellerud to Tveita, started in the mid-1950s. Landwork and electrical equipment was contracted to developers, while the trackage was done by the Planning Office. The original plans called for the use of 600 to 650 volt (V) direct current (DC) fed via a pantograph, to allow comparability with the western light rail. This was later changed to 750 V DC via a third rail. This was chosen to allow a higher diameter, and thus a higher ampere, and easier maintenance. The system also took into use cab signaling and moving blocks, which were cutting edge technology at the time, and had only been implemented on the Stockholm Metro in Europe by then. While the permitted headway on the common sections was set to 90 seconds, it was set to 120 seconds on the Grorud Line. The original plans called for a depot on each of the lines, including the Grorud Line, but this was later changed to a central depot at Ryen.
  The first part of the line, from Hellerud to Haugerud, was opened on 18 November 1970, four years after the first part of the metro. The line was further extended to Trosterud on 15 December 1974, to Furuset on 19 February 1978, and finally to Ellingsrudåsen on 8 November 1981. The line took into use T1000 electric multiple units which could be up to six cars long. The cost of the Furuset ended at 48 million Norwegian krone. Originally the service terminated at Jernbanetorget in the city center. On 9 January 1977, the city center service was extended to Sentrum. However, this station was closed from 20 March 1983 to 7 March 1987, and reopened as Stortinget.
  From 20 November 1995, the trains on the Grorud Line continued all the way through the Common Tunnel to and continued along the Røa Line. In June 2010, the headway on the line was reduced from 15 to 7.5 minutes, with half the departures terminating at Stortinget. The reason was that the Røa Line was having its power supply upgraded, and Line 2 would only be able to run with three-car trains. From 6 November 2010, Line 1's eastern service was moved from the Lambertseter Line to the Furuset Line, thus giving eight services per hour along the latter. This was possible because of the upgrade of the Holmenkollen Line to metro standard. The Line 1 services replaced the extra services on Line 2.
caption: Construction of the tunnel at Lindeberg in 1974
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