The foundation of Czechoslovakia in 1919/20 led to more formalities at the border, which runs east of Waldsassen, near Schloppenhof (now Slapany).

After the annexation of the Sudetenland by Germany in 1938 the route was served by a fast train from Munich to Carlsbad (now Karlovy Vary).

On 30 May 1986 Deutsche Bundesbahn closed passenger services, which at times had had more than ten pairs of trains per day.

The Federal Railway Authority (Eisenbahn-Bundesamt) approved the closure of the Mitterteich–Waldsassen section on 1 August 1995 and it took place on 5 November 1995.

A 700 mm gauge Feldbahn railway was operated from the Steinmühle station by Bayerische Basalt AG to a quarry.