The whole of the Black Forest was once linked by the railway. In the eastern part of the Northern Black Forest by the Enz Valley Railway from Pforzheim to Bad Wildbad, by the Nagold Valley Railway from Pforzheim via Calw and Nagold to Horb am Neckar, by the Württemberg Black Forest Railway from Stuttgart to Calw and the Gäu Railway from Stuttgart to Freudenstadt or its present-day section from Eutingen to Freudenstadt.