Because of the large amounts of traffic going through the station even before World War I, plans were made in 1914 to extend the station. There was a new, slightly elevated platform on the northern side for the S-Bahn, and the existing platforms had been made slightly narrower, leaving one platform for the S-Bahn, and two platforms for long distance trains. The steel-truss, double arched train shed was built between 1919 and 1925, featuring large glass fronts. On the northern side of the building, two entry halls in expressionist style were built, and the whole northern side was covered by a characteristic dark tile. The southern facade was only plastered until the last renovation in 1999, when it was also covered by tile.