U4 (Frankfurt U-Bahn)
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| U4 | |
 |
|
| Stations | Transfers |
|---|---|
| Bockenheimer Warte | U6, U7 |
| Festhalle/Messe | |
| Frankfurt Hbf | U5, DB |
| Willy-Brandt-Platz | U1, U2, U3, U5 |
| Dom/Römer | U5 |
| Konstablerwache | U5, U6 |
| Merianplatz | |
| Höhenstraße | |
| Bornheim-Mitte | |
| Seckbacher Landstraße | |
The U4 is a line on the Frankfurt U-Bahn. It is the only line on the whole system which runs entirely underground over its total length.
