Trains run from Betzdorf via Haiger to Dillenburg, partly over a section of the Dill line.

The decline of the Heller Valley Railway began in 1915 when the extension of the Dill line was opened to Siegen via Rudersdorf.

Both the high-quality passenger services and the bulk of freight traffic now used the new route to Gießen and onto the Rhine-Main area.

Due to the decline in passengers, Deutsche Bundesbahn eventually requested permission to close the line.

The DreiLänderBahn operates regional services between Betzdorf and Dillenburg every two hours as much as possible from Monday to Friday.

Prior to 13 December 2015, it was designated as RB 41 within the Rhine-Main Transport Association (Rhein-Main-Verkehrsverbund) area.