The Deutsche Reichsbahn, also known as the German National Railway, the German State Railway, German Reich Railway, and the German Imperial Railway, was the German national railway system created after the end of World War I from the regional railways of the individual states of the German Empire. The Deutsche Reichsbahn has been described as "the largest enterprise in the capitalist world in the years between 1920 and 1932"; nevertheless, its importance "arises primarily from the fact that the Reichsbahn was at the center of events in a period of great turmoil in German history".

The Deutsche Bahn AG is the national railway company of Germany, and a state-owned enterprise under the control of the German government. Headquartered in the Bahntower in Berlin, it is a joint-stock company (AG) and the largest railway company in the world.