Line U4 is a line on the Vienna U-Bahn metro system.It currently has 20 stations and it runs 16.5 km from Hütteldorf to Heiligenstadt.It is connected to Line U6 at Längenfeldgasse Line U1 and Line U2 at Karlsplatz Line U3 at Landstraße Line U1 at Schwedenplatz Line U2 at Schottenring and Line U6 at Spittelau. It opened in 1976.
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