Why is the berlin wall coming down important?

Because the S-Bahn was operated by the DR, West Berliners vented their frustration at the building of the wall by boycotting it since its fares were seen as subsidising the communist regime in the East. "Keinen Pfennig mehr für Ulbricht," or "no pennies for Ulbricht," became the S-Bahn opponents' chant. Within days of the Berlin Wall being built, the BVG, with assistance from other transit companies in West Germany, began providing "solidarity with Berlin buses" – new bus services which paralleled the S-Bahn lines and therefore provided an alternative. After many years of declining passenger usage and difficult industrial relations between the West Berlin workforce and their East Berlin employers, most of the western portion of the S-Bahn was closed down in September 1980 following a strike. A 20-minute service was still provided on the Stadtbahn from Westkreuz to Friedrichstraße as well as services on the Nord-Süd Bahn between Frohnau, Friedrichstraße, Lichtenrade or Wannsee.