 In contrast to the S5, the trains do not stop underground, but on the above-ground long-distance tracks.While the S5 services turn to run on the Homburg Railway immediately north of Frankfurt West station, the Taunus Railway service (the RB 15) first runs on the regional tracks towards Frankfurt-Höchst (Taunus Railway) and then curves on the Rebstock lands on a connecting curve ("Rebstockkurve") of the former Bad Nauheim–Wiesbaden railway ("Bäderbahn") to join the route of the S5 shortly before Rödelheim station.It follows the S5 service with only two stops in Rödelheim and Oberursel to Bad Homburg
The regular interval services start In Bad Homburg.