The Frankfurt Schlachthof–Hanau railway is a railway line that is used by the Rhine-Main S-Bahn and connects the Frankfurt City Tunnel via the Offenbach City Tunnel and Mühlheim with Hanau. It mostly
The S9 service of the S-Bahn Rhein-Main system bearing the KBS number 645.9. It is largely concurrent with the S8 service, diverging only to bypass Mainz.