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 construction of housing.
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The first operation on the Lambertseter Line with the SM53-trams was on 10 April 1957, after technical trials had been conducted with the Gullfisk-trams.
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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.