The advent of the metro fueled the closing of tram lines, and in 1966 the connection between Grensen and Sagene closed, followed the next year by the Vippetangen Line (that since 1964 had been used for grain transport), the Helsfyr Line and the Simensbråten Line branch of the Ekeberg Line. The last closing of a tram line occurred on 24 June 1968 when the connection between Schewigaard Street and Etterstad was terminated. The tide changed in 1969 when the turning loop at Sinsen was needed to build the Sinsen Interchange—instead of closing the line a new loop was built at Muselunden. In 1972 the planned closing of the Ekeberg Line was canceled and remained, despite a new line needing to be built to allow passage during the construction of the central station.