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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.