Harzer Schmalspurbahnen
They are also in use on the Harz Narrow Gauge Railways to transport limestone from the Unterberg quarry to Nordhausen, where they are transferred to the DB system at a pit between the station and Hesseröderstraße. Trains are diesel-hauled and typically consist of 12 Fccpps ballast hopper wagons from Voestalpine Railpro; the "Rollböcke" are painted bright pink.