The Rhine-Ruhr Stadtbahn is an umbrella system of all of the Stadtbahn lines included in the integrated public transport network of the Verkehrsverbund Rhein-Ruhr (VRR), which covers the Rhine-Ruhr metropolitan area in western Germany. It does not include the Cologne and Bonn Stadtbahn systems, which are integrated in the Verkehrsverbund Rhein-Sieg (VRS).

The Bochum-Gelsenkirchener Straßenbahnen AG, abbreviated BOGESTRA, is a public transport operator in the Ruhr area, most notably in the cities of Bochum, Gelsenkirchen and Herne. As of 2012, the company operated, in whole or in part, 9 rail lines, and 65 bus lines. In 2012, BOGESTRA transported a total of 144.9 million passengers. The company is a member of the Verkehrsverbund Rhein-Ruhr (VRR) public transport association.