o change from east-to-west-bound S-Bahn trains to north-to-south-bound U-Bahn trains. Konstablerwache station is the second busiest train station regarding daily passenger volume in Frankfurt (191,000) after the central station. The third-busiest train station is Hauptwache station (181,000).
The city has two underground railway systems: the U-Bahn and the S-Bahn, as well as an above-ground tram system. Information about the U- and S-Bahn can be found on the website of the RMV.
Nine S-Bahn lines (S1 to S9) connect Frankfurt with the densely populated Rhine Main Region. Most routes have an at least 15 minute service during the day, either by one line running every 15 minutes, or by two lines servicing one route together with a 30 minutes schedule each. All lines, except line S7, run through the Frankfurt city tunnel and serve the stations Ostendstra�e, Konstablerwache, Hauptwache, Taunusanlage and Frankfurt Central Station. When leaving the city the S-Bahn travels above ground. It provides access to the trade fair (S3, S4, S5, S6), the airport (S8, S9), the stadium (S7, S8, S9) and nearby cities such as Wiesbaden, Mainz, Darmstadt, R�sselsheim, Hanau, Offenbach am Main, Oberursel, Bad Homburg, Kronberg, Friedberg and smaller towns that are on the way.
The U-Bahn has nine lines (U1 to U9) serving Frankfurt and the larger suburbs of Bad Homburg and Oberursel in the north. The trains that run on the line are in fact lightrails as many lines travel along a track in the middle of the street instead of underground further from the city centre. The minimum service interval is 2.5 minutes, although the usual pattern is that each line runs with a 7.5�10 minute frequency which combines to approx 3�5 minutes on the city centre sections served by more than one line.
Frankfurt has ten tram lines (11, 12, 14 to 21), with trams arriving usually every 10 minutes. Many sections are served by two lines, combining to give a 5 minute frequency during
