The approximately 20 km long Ländchesbahn connects Wiesbaden with Niedernhausen in the Taunus. It was opened on 01.07.1879 together with the Ludwigsbahnhof. Over the years, the route between Wiesbaden and Erbenheim has undergone various changes, such as the connection to the Taunus Railway from Frankfurt, the right bank of the Rhine to Koblenz and the connection to Breckenheim. After Erbenheim, the line is still single-track and non-electrified, initially running through the historic Ländchen, to which the railroad owes its name. On the now ascending route to the north, the Ländchesbahn first passes under the high-speed railroad line between Cologne and Frankfurt before passing the A 3 and the B 455 on the Taunus ridge through the 197 m long Grauer-Stein tunnel. After this passage, the line drops steeply to Niedernhausen. There are still stops in Erbenheim, Igstadt and Auringen-Medenbach. The stop installed for the Rhein-Main-Theater, a building complex specially constructed for musicals on the Taunuskamm, has no longer been served since the musical operations were discontinued in 1998. After the Second World War, the commuter service on the line was initially operated with battery-powered railcars and then with diesel locomotives. Vectus Verkehrsgesellschaft has operated the line since 2004.