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The Regionaltangente West (German for regional tangent west, RTW) is a railway project under construction in the Rhine-Main area. Contrary to existing connections, it shall establish tangential connections across the western region, avoiding Frankfurt main station and the Frankfurt City Tunnel. Oprations are expected to start in 2030. [1]
As a tram-train, it will use both preexisting tracks (Homburg Railway, Soden Railway, Frankfurt Airport loop, Main-Neckar Railway) and new, light rail connections. Interchanges to existing connections of the Rhine-Main S-Bahn include Bad Homburg station (S5), Eschborn Süd station (S3/S4), Frankfurt-Höchst station (S1/S2), Frankfurt Airport regional station (S8/S9) and Neu-Isenburg station (S6). Additionally, a connection to line U7 of the Frankfurt U-Bahn will be established in Frankfurt-Praunheim.