Wikipedia: "Köln Hauptbahnhof (English: Cologne Central Station, abbr.: Köln Hbf) is the central railway station in Cologne, Germany.
The station is an important local, national and international hub, with many ICE, Thalys and InterCity trains calling there, as well as regional RegionalExpress, RegionalBahn and local S-Bahn trains. EuroNight and DB NachtZug night services also call at the station. It has frequent connections to Frankfurt by way of the Cologne-Frankfurt high-speed rail line, which starts in southern Cologne. On an average day, about 280,000 travellers frequent the station, making it fifth busiest station in Germany.
The station is situated next to Cologne cathedral.
There is another important train station in Cologne, the Köln Messe/Deutz railway station across the river Rhine, just about 400 metres away from Köln Hauptbahnhof. The stations are linked by the Hohenzollernbrücke, a six-track railway bridge with passenger walkways on each side. Frequent local services connect the two stations as well."