Donautalbahn
Plans formulated by the Deutsche Reichsbahn for military reasons in 1937 to expand to twin tracks the section between Herrlingen and Immendingen, which had been entirely single-tracked, had strong proponents during the course of World War II, but were not further pursued after the end of the war. After the completion of the Danube Valley Railway, the railway property around the railway node Ulm were expanded several times, namely between 1899 and 1911 by the Royal Württemberg State Railways, and between 1924 and 1928 by the Deutsche Reichsbahn. In Tuttlingen, which became a railway node with the completion of the section from Inzigkofen, the railway division Stuttgart "(Reichsbahndirektion Stuttgart)" replaced the entire station and property between 1928 and 1933 with new construction.