from saarbrücken through the köllertaler wald (köller valley forest) and riegelsberg to riegelsberg-güchenbach, saarbahn follows the course of the historical riegelsberg tramway: an interurban tram line from st.johann/saarbrücken via riegelsberg to heusweiler, which was opened in 1907. the line broadly followed today's federal highway 268, which also continues directly from güchenbach to heusweiler. the line served the mines in heusweiler-dilsburg and von der heydt. the tramway was replaced by trolleybuses in 1953 and was replaced in turn by diesel-powered buses in 1964.