Following the war, no reason could be found not to unite the two earlier railway stations into a single building. In particular, both railways had come into the ownership of the same company, the ÖBB (Austrian federal railways). The modern Südbahnhof was built between 1955 and 1961 to plans by Heinrich Hrdlicka, in which the twin stations were united in a single building. Two underground platforms serve the S-Bahn network (lines S1, S2 and S3), known since the demolition of the main line platforms as Wien Quartier Belvedere. At about the same time, the line between Vienna and Gloggnitz was electrified. During the re-building, the Südbahnhof was extended towards the Schweizergarten, while the constituent parts of the old main hall were numbered and taken away to be used at a depot in Floridsdorf.
