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In page West Berlin:

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After the Berlin Blockade transit trains (German: Transitzüge) would leave and enter West Berlin only via one line through Berlin-Wannsee railway station (W) and Potsdam Griebnitzsee railway station (E). All transit trains would start or end in East Berlin, passing through West Berlin with only one stop in the Western Berlin Zoologischer Garten railway station, which became West Berlin's main railway station. Until 1952, the Reichsbahn also permitted stops at other stations on the way through the Western sectors.[citation needed]