Line S8 is an S-Bahn line operated by DB Regio on the Rhine-Ruhr network. It runs from Hagen Hauptbahnhof in the west to Mönchengladbach Hauptbahnhof in the east via Wuppertal Hauptbahnhof, Düsseldorf Hauptbahnhof and Neuss Hauptbahnhof. It is operated between Düsseldorf and Wuppertal-Oberbarmen station at 20-minute intervals using class 422 electric multiple units.[2] One out of three trains continues to Hagen, running hourly. An S 9 service and three Regional-Express services (Wupper-Express, Rhein-Münsterland-Express and Maas-Wupper-Express) also operate between Wuppertal-Vohwinkel and Hagen each hour.
Line S 8 runs over lines built by various railway companies:
S-Bahn services commenced on the whole length of the route on 29 May 1988.