Berlin Westkreuz (literally "Berlin West Cross") is a station in the Charlottenburg district of Berlin. It is served by the S-Bahn lines S3, S41, S42, S46, S5, S7 and S9 and so represents a major interchange point on the Berlin S-Bahn network. It lies at the opposite end of the Stadtbahn to Ostkreuz and is one of the four main stations on the Ringbahn (circle line). S-Bahn lines run from Westkreuz station in five directions: via the Berlin–Blankenheim railway to and Potsdam, via the Spandau Suburban Line to Olympiastadion and , via the Ringbahn to Westend or Halensee and via the Stadtbahn to the city centre. Operationally, the station is made up of two independent operating points. The lower part is run as Berlin Westkreuz (Stadtbahn) station, abbreviated as BWKS, while the upper is run as Berlin Westkreuz (Ringbahn) station, abbreviated as BWKRR. Location Westkreuz station is located in a sparsely populated area on the border between the districts of Charlottenburg, Halensee, Westend and Grunewald. The boundaries between the districts of Charlottenburg in the north and Halensee in the south follow the course of the platforms in the station area, so that they are completely in Charlottenburg, while the tracks to the east, west and south are in Halensee. The border with the districts of Westend in the north and Grunewald in the south is only a few metres west of the tracks, while the only access to the platforms is on the northwest side of the station from the district of Westend. The route to the Messe Berlin (exhibition grounds) is via the streets of Am Westkreuz and Halenseestraße. Although originally intended as one of the main access stations to the exhibition grounds, they are better served by the stations of Messe Süd (formerly: Eichkamp) and Messe Nord/ICC (formerly: Witzleben) and the U-Bahn stations of Kaiserdamm and Theodor-Heuss-Platz and the buses of the Berliner Verkehrsbetriebe. Therefore, the station is mainly used for changing trains. History Before the station was built, a pair of tracks ran west of Charlottenburg station to Berlin-Grunewald station as an extension of the Stadtbahn. Two further pairs of tracks connected the station with the northern half of the Ringbahn via Witzleben and Westend and with the southern Ringbahn via Halensee. The extended Stadtbahn and the curve to the southern Ringbahn crossed on the level in the system of tracks to the west of Charlottenburg station.