 It is complemented by a Regionalbahn stopping service, the "Rhein-Erft-Bahn" (RB 27), running also between Mönchengladbach Hauptbahnhof and Koblenz Hauptbahnhof.On weekends it stops at some additional stations between Cologne Hbf and Koblenz Hbf.The "Rhine-Erft-Express" runs from Mönchengladbach via the Cologne–Mönchengladbach line to Cologne, where it stops, despite its classification as a Regional-Express, at all stations.