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In page West Berlin:
"As for the S-Bahn, operated throughout Berlin by the East German Reichsbahn, the construction of the Wall meant a serious disruption of its integrated network, especially of the Berlin's circular S-Bahn line around all of the Western and Eastern inner city. The lines were separated and those mostly located in West Berlin were continued, but only accessible from West Berlin with all access in East Berlin closed. However, even before the Wall had been built, West Berliners increasingly refrained from using the S-Bahn, since boycotts against it were issued, the argument being that every S-Bahn ticket bought provided the GDR government with valuable Western Deutsche Marks.[citation needed]
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