Bielefeld Hauptbahnhof is the main station in the region of Ostwestfalen-Lippe in German state of North Rhine-Westphalia. It is an important station because of the size of the city of Bielefeld and its location at the Bielefeld Pass, which makes it a node for long-distance and regional traffic. It was opened in 1847 with the opening of the Cologne-Minden trunk line. It is classified by Deutsche Bahn as a category 2 station.