The rebuilding of the Mühlauer Bridge was completed during the Nazi years, creating a major new road approach for the city. In 1939 the rails for the local line to Solbad Hall (as Hall in Tirol had recently been renamed) were added to the new road over the bridge, and from now Line 4 used the rails of Line 1 to approach the Mühlauer Bridge. In 1941, old rails were recycled to double the rest of Line 3 and build a new double-track section for it, now extending to Rudolf Greinz Street where a turning loop was created. 1941 was also the year in which the Innsbruck Transport Company (Innsbrucker Verkehrsbetriebe), incorporating the former L.B.I.H.i.T. along with several local bus operations, was founded.