page_title: Lilleaker Line
section_title: History
hierarchical_section_title: Lilleaker Line / History
caption_attribution_description: English: Construction of the extension of the Lilleaker Line (today the Kolsås Line) between Bekkestua and Haslum.Norsk bokmål: Bildet er tatt under arbeidet med forlengelsen av Lilleakerbanen til Bekkestua og Haslum. Forlengelsen stod ferdig 1924. Arbeidere med vogner, bildet er tatt 05.09.1922
context_page_description: The Lilleaker Line is a suburban tramway from Skøyen in Oslo westwards to Jar, Bærum in Norway. It is operated by Line 13 from Grefsen to Bekkestua of the Oslo Tramway, operated by Oslo Sporvognsdrift. The line continues on the Oslo Metro west of Jar as part of the Kolsås Line, and as a street tramway on the Oslo tramway system at Skøyen as the Skøyen Line.
context_section_description: In 1912, Kristiania Elektriske Sporvei started working on plans to extend the street tram Skøyen Line towards Bestum or Øraker. The application for the section from Skøyen to Lilleaker was sent in 1913 and concession was granted in July 1915. Construction began immediately, trial runs were made on 8 May 1919 and the line opened the following day.
  In 1917, two proposals were made for a suburban tram line further north. The southern proposal was to build the line as an extension of the Lilleaker Line. The line would go from Lilleaker  and extend towards Jar and Nadderud to Haslum. The northern proposal was for an extension of the Røa Line (at the time called the Smestad Line) via Røa to Hosle, Haslum and Fleskum to Kolsås. The latter was essentially a combination of the current Røa and Kolsås Line. The two proposals caused local debate with people in western Bærum in general supporting the northern line and people in eastern Bærum supporting the southern line. An agreement was quickly reached with Kristiania Elektriske Sporvei (KES), that owned the Lilleaker Line. In 1921, the municipal council voted in favor of the southern line after rejecting a proposal to negotiate trackage rights with Holmenkolbanen. The main argument for the southern alternative was that the municipality would not have to pay any of the investment costs for the section of the line that would be localed within Aker.
  In 1924, KES' operations in Oslo were expropriated and became Oslo Sporveier. However, the Lilleaker Line was kept outside the expropriation. The expansion to Bærum was financed in part by the cash from the sale and in part from free land from the municipality. Concession from Lilleaker to Bekkestua was granted in 1922, and on 28 December the municipality voted to extend the line from Bekkestua to Haslum. The line to Bekkestua opened on 1 July 1924 and the extension to Hslum on 4 November. KES rebranded itself and became Bærumsbanen. The company bought twelve Class A trams with twelve trailers from Zypen & Charlier of Germany. After running along the Bærum Line to Skøyen, the trams continued along the Oslo Sporveier-owned Skøyen Line to Athenæum in the center of Oslo. The stations had a small building where there was a kiosk, telephone, ticket sale and freight handling.
  The Bærum Line was extended to Kolsås on 1 January 1930. In 1924, one of the conditions for the concession was that the line was to be connected to the Common Tunnel of the Holenkollen Line. Oslo Municipality demanded that the company either turn its trams at Skøyen or allow the municipality to purchase the company cheap. On 1 October 1934, Bærumsbanen was bought by Oslo Sporveier and made a subsidiary. The two companies had a common executive management, but retained separate operations. At the same time, Aker Municipality's tram company Akersbanerne was left operating a single line east of the city center. In 1936, it was decided that Bærumsbanen would take over operation of this line, by operating the trams from the Kolsås Line through the city center to connect to the Østensjø Line. Operations started on 4 January 1937, and the 25 kilometres (16 mi) line was marketed as the Østensjø–Bærum Line. Although Bærumsbanen took over Akersbanerne's three Class A trams, up to three units from Ekebergbanen were also leased.
  From 1937 to 1939, Oslo Sporveier received 46 Class B trams (the Gullfisk), of which half were transferred to Bærumsbanen and set to supplement the Class A. In 1939, construction of a connection from Jar to Sørbyhaugen on the Røa Line was started. When it opened on 15 June 1942, the 11.9 kilometres (7.4 mi) section from Sørbyhaugen to Kolsås was designated the Kolsås Line, and the 3.8 kilometres (2.4 mi) section from Jar to Skøyen was designated as the Lilleaker Line. A balloon loop was built at Jar, and the Lilleaker Line trams that served the Lilleaker Line could start turning there. This allowed for transfer between the two lines. In 1944, the ownership of rolling stock and all but two employees in Bærumsbanen were transferred to Oslo Sporveier. However, the
caption: Construction of the extension from Bekkestua to Haslum in 1922
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