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

Because of increasing traffic and its military significance in the Franco-Prussian War of 1870/71, track on the line was duplicated in 1871.

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.