long-distance, regional and freight traffic. After 24 years of planning and resolution of legal challenges, construction of the first phase between Frankfurt-West and Bad Vilbel started in December 2017. The S6 will receive a new station between Frankfurt-West and Eschersheim to serve Frankfurt-Ginnheim. Commissioning of the expanded line is planned for December 2022. A further application of such two-system metropolitan railway vehicles is provided in the west of Frankfurt: Starting in Bad Homburg and the Frankfurt Northwest Center so-called Regional Tangent West (RTW) on Eschborn South, Sulzbach (Taunus), Frankfurt-Sossenheim, Frankfurt-Höchst, Frankfurt Airport and Frankfurt Stadium to the Isenburg center in Neu-Isenburg or after Dreieich-Buchschlag run. The Regional Tangent West is to operate as a mixed operation of two-system metropolitan railway car on mostly existing light rail and railway / S-Bahn routes, which makes their realization - despite the great track length - quite reasonably priced. Their primary task is to strengthen the tangential traffic, to spare the passengers tiresome and time-consuming detours via the Frankfurt city center and to reduce the congestion of the Frankfurt City Tunnel. The realization is planned for the end of 2023. Other projects under consideration include an extension of the S1 from Rödermark-Ober-Roden to Dieburg, an extension of the S7 from Riedstadt-Goddelau to Biblis, and a branch of the S7 to Groß-Gerau. The Frankfurt district of Oberrad has seen a campaign to reactivate its rail station that was mothballed in the 1980s as an S-Bahn station. In the mid-90s was also a rapid-transit railway line in planning, which should be led from Frankfurt over Rüsselsheim to Darmstadt. The train should come from Darmstadt coming before Bischofsheim in a curve yet to be built (Schindberg curve) to Frankfurt. This would have given the Darmstadt the long desired direct connection to the Frankfurt airport. Furthermore, such a fast connection between Darmstadt and Rüsselsheim would have been created, which would have brought a significant time savings for the many commuters. This project failed at the community Bischofsheim, which refused to build a bend in their district. There they pointed out that a change of direction in Bischofsheim station was possible. According to the Darmstadt-Dieburg local transport organization, the realization of this route is dependent on the expansion of the Main-Rhine-Bahn and a compression of the clock on this route. However, this should be done in the form of an extended to Frankfurt S-Bahn line S -Bahn RheinNeckar. The