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.