Simultaneously with the opening of the S-Bahn tunnel, an S-Bahn line was opened parallel with the Frankfurt-Hanau line, known as the Frankfurt Schlachthof–Hanau railway. Since its opening that has been operated by services of S-Bahn lines S8 and S9 to Hanau.
Infrastructure
The station has three platform tracks that are used for S-Bahn services on lines S1, S2, S8 and S9. There is no platform on the main line used by regional and long distance services on the south Main railway any more and its tracks, which are north of the S-Bahn, are separated by a soundproof wall. At the western end of the station, two tracks run into the tunnel towards Frankfurt and one track runs to Offenbach Hauptbahnhof. This track was formerly used regularly by line S 2, but it is now only used in exceptional cases. At the eastern end of the station, the S-Bahn line branches at a level junction towards Hanau and Offenbach-Bieber. Between the branches there are sidings for parking S-Bahn trains, as many trains from Frankfurt terminate at Offenbach Ost.
The city of Offenbach has proposed that this station be renamed Offenbach Hauptbahnhof because it has better transport connections than the current Offenbach Hauptbahnhof.
Operations
All S-Bahn services run at 30-minute intervals. In the peak hour, extras services are run so that each services runs at 15-minute intervals. In the peak hour lines S8 and S9 run on almost the same route, generally at 15-minute intervals. Line S 8 runs only during the peak hour to Hanau; at other times it begins or ends at Offenbach Ost. Line S1 services sometimes begin in Offenbach Ost and then just runs to Frankfurt-Höchst or Hochheim.
Prior to 14 June 2010, some S 2 services ran from Offenbach Ost to Offenbach Hauptbahnhof because of lack of capacity in the Frankfurt S-Bahn tunnels. These now all run through the tunnels.
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