The Bergisch-Markisch Railway Company, also referred to as the Berg-Mark Railway Company or, more rarely, as the Bergisch-Markische Railway Company, was a German railway company that together with the Cologne-Minden Railway and the Rhenish Railway Company was one of the three (nominally) private railway companies that in the mid-19th century built the first railways in the Ruhr and large parts of today's North Rhine-Westphalia. Its name refers to Bergisches Land and the County of Mark.

The Prince William Railway Company was an early horse-drawn railway in Germany. It was founded as the Deil Valley Railway Company in 1828 and renamed in 1831. It built a 820 mm narrow gauge line that ran for a Prussian mile along the Deilbach valley from a point near Kupferdreh Old Station in Hinsbeck, a suburb of Kupferdreh, to Nierenhof near Langenberg. This route is now part of the Wuppertal-Vohwinkel–Essen-Überruhr railway and served by Rhine-Ruhr S-Bahn line S9 trains.