U-Bahn Line B (Frankfurt U-Bahn)

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The B Line is the second line in the network of the Frankfurt U-Bahn, running in a west–east direction from the central railway station (Hauptbahnhof) through the old town to Konstablerwache, where it splits into two branches to Bornheim (served by the U4) and Preungesheim (served by the U5). Originally planned as an independent main line, part of the D Line forms an extension of U4 to Bockenheimer Warte from the central railway station.