Hauptbahnhof means "Central Station" in English. The Hauptbahnhof in Cologne (or Köln) is huge and sort of resembles an airport, in my opinion. Since public transportation in Europe is so much better and reliable than in America, you can get to many other German and European cities quickly and easily from this train station. We didn't actually need to go anywhere, but we spent some time walking around the train station, since they are always interesting spots to people watch as locals and tourists rush about to catch their train. This station is one of the busiest railway stations in Germany.