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In addition the construction of several smaller routes followed up to 1876, an extension in an easterly direction, the Upper Ruhr Valley Railway to Arnsberg, Bestwig, Brilon-Wald and Warburg and Holzminden on the Weser river. Here it connected with the line to Kassel of the Frederick William Northern Railway Company, which it took over on 17 April 1868, with its 130-kilometer line from Gerstungen via Bebra and Kassel to Bad Karlshafen for eight million thalers. After 1870 the network was extended on the west bank of the Rhine with the 66 km long line from Rheydt-Odenkirchen to Aue and Düren. During the nationalisation of the company in 1880 the company took over the 78 km railway network of the Dutch-Westphalian Railway Company from Gelsenkirchen-Bismarck to Dorsten, Borken to Winterswijk in the Netherlands, with a branch from Borken to Bocholt.