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The Hamburg U-Bahn is a rapid transit system serving the cities of Hamburg, Norderstedt, and Ahrensburg in Germany. Although referred to by the term U-Bahn (the "U" commonly being understood as standing for Untergrund "underground"), most of the system's track length is above ground. The network is interconnected[vague] with the city's S-Bahn system, which also has underground sections. It is operated by Hamburger Hochbahn within the Hamburger Verkehrsverbund (HVV). It was opened in February 1912,[4] and comprises four lines serving 93 stations,[2] with a route length of 106.4 kilometres (66.1 mi) in 2019.[6]
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