Between Cologne Hauptbahnhof and Köln-Ehrenfeld, the RE 8 regional express (Rhein-Erft-Express) service is operated with class 425 multiple units and the Regionalbahn RB 27 service (Rhein-Erft-Bahn) with push-pull trains consisting of three double-decker coaches and a locomotive of class 143. Between Cologne and Horrem, the Regionalbahn RB 38 service (Erft-Bahn) is operated with class 644 railcars and S-Bahn services S 13 and S 19 with class 423 multiple units. The S 12 service also runs between Cologne and Düren with class 423 sets.