Albtalbahn
After the Second World War, both line and rolling stock were in a dilapidated condition, requiring comprehensive modernisation. The DEBG, however, had little interest in the continued operation of the railway. In the political debate about the future of Alb Valley Railway, the city of Karlsruhe took the initiative. It was mainly interested in establishing good suburban services between Karlsruhe, Rüppurr and Ettlingen and eliminating the need for passengers to change at Karlsruhe Albtalbahnhof from the Alb Valley Railway to trams. Therefore, it proposed the gauge conversion of the line to standard gauge and linking it to the urban tram network.