 At first the proposal was rejected by Oslo Sporveier because it was "technically impossible".From June 1967, Line 9, that ran along the Lilleaker Line via the Skøyen Line to the city center and onwards along the Østensjø Line, was truncated to Jernbanetorget, as the Østensjø was converted to a metro line.Calculations showed that if the Lilleaker Line or the Skøyen Line and the Ekeberg Line were connected, between them one tram less would be needed, and the Ekeberg Line would have a service through the city center.