U-Bahn

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The U-BahnU-Bahn The U-Bahn is Vienna's underground railway / metro. I've often lived closest to the U4, although the flat I have in the 5th district will soon be around the corner from a station on the U2 extension. is Vienna’s underground railway / metro. I’ve often lived closest to the U4, although the flat I have in the 5th district will soon be around the corner from a station on the U2 extension.