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In page Alexanderplatz:

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In 2005, the Berliner Verkehrsbetriebe began work to extend the tram line from Prenzlauer Allee to Alexanderplatz (Alex II). This route was originally to be opened in 2000 but was postponed several times. After further delays caused by the 2006 FIFA World Cup, the route opened on 30 May 2007.[citation needed]