The pontoon bridge was replaced in 1934 with the new Tranebergsbron. Planning for a Metro system started around this time, and in 1944 the Ängbybanan route was built from Alvik to Åkeshov (and later Islandstorget), operated initially with trams but designed as a grade-separated route for later conversion. Conversion happened in 1952, forming the western section of the present-day Green Line. Consequently, the Nockebybanan was cut off from running into the city and became a feeder route for the Metro at Alvik.