After the Warburg–Volkmarsen section was closed, the track to Obervellmar was integrated into the continuous main line through Volkmarsen station.

On 1 January 2002, the DB subsidiary Kurhessenbahn leased the infrastructure and took over the operation of the local passenger and freight traffic on the line.

Until December 2013, the RT 4 trains on the inner-city ring route ran through Königsstraße and Königsplatz, among other places.

In addition to the RegioTram, Regional-Express trains run hourly between Kassel-Wilhelmshöhe and Korbach, stopping only in Obervellmar, Weimar and Zierenberg to Wolfhagen.

Additional trains from Wolfhagen are offered by the RegioTram line RT 4 through central Kassel to Holländische Straße.

The line is operated with Stadler GTW low-floor multiple units and 14 Siemens Desiro (class 642) sets.