The Hagen–Dieringhausen railway (also called the Volmetalbahn: Volme Valley Railway) is a mostly single-track (continuously double track as far as Lüdenscheid-Brügge) and non-electrified railway line from Hagen Hauptbahnhof via Lüdenscheid-Brügge, Meinerzhagen and Gummersbach to Gummersbach-Dieringhausen in the German state of North Rhine-Westphalia. The railway and the Regionalbahn service are both named after the Volme river, which they both follow for most of their route.