The Vienna U-Bahn (an abbreviation of Untergrundbahn, or underground railway) is the rapid transit (metro) system for Vienna. With the October 2013 opening of the 4.2 kilometers (2.6 mi), 3 station extension of the U2 line, the five line U-Bahn network consists of approximately 80 kilometers (50 mi) of route, serving 104 stations. It is the backbone of one of the best performing public transport systems worldwide according to UITP (International Association of Public Transport) in June 2009. More than 1.3 million passengers rode the Vienna U-Bahn every day in 2009, and 567.6 million passengers utilized the U-Bahn in 2011. The network is undergoing expansion and rolling stock renewal. Since 1969, 200 million euros have been invested annually in the extension of the Vienna U-Bahn.
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