The Rhein-Erft-Express is a Regional-Express service in the German states of North Rhine-Westphalia and Rhineland-Palatinate. It is numbered as line RE 8 and connects the cities of Mönchengladbach, Cologne, Bonn and Koblenz with each other and their surroundings, running hourly. 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. It is operated by DB Regio with Alstom Coradia Continental EMUs. Route 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. Near Grevenbroich it crosses the Erft river. In Cologne, it crosses the Rhine on the Hohenzollern Bridge and runs on the eastern bank via Porz (Rhein) to Troisdorf, where it runs on to the Right Rhine line. Between Menden (Rheinl) and Unkel it stops at all stations. Trains cross the Urmitz Railway Bridge over the Rhine via Koblenz Stadtmitte to Koblenz Hauptbahnhof. In contrast, the RB 27 Rhein-Erft-Bahn takes another route via the airport loop with stop at Cologne/Bonn Airport to Troisdorf, also on to the Right Rhine line. From Neuwied, the line RB 27 runs via Koblenz-Ehrenbreitstein and cross the Horchheim Railway Bridge over the Rhine to Koblenz Hauptbahnhof. Syndicates and fares The Rhine-Erft Express is funded jointly by three transport associations: the Verkehrsverbund Rhein-Ruhr (Rhine-Ruhr transport association, VRR), which includes the Mönchengladbach–Rommerskirchen section, the Verkehrsverbund Rhein-Sieg (Rhine-Sieg transport association, VRS), which includes the Stommeln–Bad Honnef section and the Rhineland-Palatinate Zweckverband SPNV-Nord (regional rail transport “purpose association” North). VRR fares apply between Mönchengladbach and Rommerskirchen. Between Unkel and Koblenz the fares of the Verkehrsverbund Rhein-Mosel (Rhine-Moselle transport association, VRM) apply. Due to extensive overlap of rules VRS fares apply between Grevenbroich and Engers. History From 1998 to 2002 there was a Rhein-Erft-Express service numbered RE 18. Line number RE 8 applied to the Rhein-Holland-Express, which operated over the Venlo–Mönchengladbach–Cologne–Koblenz route. With the introduction of the second stage of the North Rhine-Westphalia integrated timetable in 2002, the VRR sought a transfer-free connection from Düsseldorf to Venlo, which meant that the Rhein-Erft-Express was cut back to Mönchengladbach and renumbered as RE 8. The section of the route from Moenchengladbach to Venlo became part of the new Maas-Wupper-Express, RE 13. From December 2002, RE 8 ran largely to today's route with push–pull trains