The Dortmund–Hamm Railway is an important and historically significant railway in Germany. It is a major axis for long distance passenger and freight trains between the Ruhr and the north and east of Germany. It is the part of the trunk line built by the Cologne-Minden Railway Company (German, old spelling: Cöln-Mindener Eisenbahn-Gesellschaft, CME) from Köln Deutz to Minden. It was opened in 1847 and has been modernized and developed several times since then.