Baden Mainline
Construction of the Baden Mainline ("Badische Hauptbahn") started in 1840 from Mannheim, running via Heidelberg to Karlsruhe, and it was extended to Basel by 1855. However, the indirect route via Heidelberg bypassed part of the natural catchment area of Mannheim which was located close to the Rhine, including towns such as Schwetzingen and Hockenheim.