Bærumsbanen, that had become partially owned by Oslo Sporveier, had a similar suburban tramway to the east of the city center, the Lilleaker and Kolsås Lines, where trams continued along street trams lines until the reached the city center.
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In 1937, the first Class B trams were delivered to Oslo Sporveier, and these put into service on the Bærum–Østensjø Line after the serial delivery started in 1939.
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The line also serves the mostly residential boroughs of Bøler and Østensjø.
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The plans would lead to the system opening in 1966, after the conversion of the Østensjø and the Lambertseter Line of the Oslo Tramway to metro standard, and supplemented with the new Furuset and Grorud Line.
The plans called for the system to open in 1966, with the conversion of the Østensjø Line and the Lambertseter Line of the Oslo Tramway, and the new Furuset Line and Grorud Line.