Berlin Zoologischer Garten Station (German: Bahnhof Berlin Zoologischer Garten, colloquially Bahnhof Zoo) is a railway station in Berlin, Germany. It is located on the Berlin Stadtbahn railway line in the Charlottenburg district, adjacent to the Berlin Zoo. During the division of the city, the station was the central transport facility of West Berlin, and thereafter for the western central area of reunified Berlin until the opening of Berlin Hauptbahnhof in 2006. It is also an interchange with the U-Bahn and the S-Bahn, which uses the Stadtbahn viaduct along with RegionalExpress and RegionalBahn trains.