Berlin Zoologischer Garten station (German: Bahnhof Berlin Zoologischer Garten; shortened to Berlin Zoo or colloquially Bahnhof Zoo) was the central transport facility in West Berlin during the division of the city; and thereafter for the western central area of Berlin until opening of the new Berlin Central Station (Hauptbahnhof) on 28 May 2006. Situated within the Charlottenburg district on Hardenbergplatz; adjacent to the Berlin Zoo; it is also an interchange with the U-Bahn and the S-Bahn; which uses the Stadtbahn viaduct; along with RegionalExpress and RegionalBahn trains.