S4 (Rhine-Main S-Bahn)

The S4 service of the S-Bahn Rhein-Main system bearing the KBS (German scheduled railway route) number 645.4

City tunnel
The city tunnel is an underground, pure S-Bahn route used by almost all services (except for the S7 service which terminates at the central station). In a short section between Mühlberg and Offenbach-Kaiserlei the South Main railway is used.

History
The S4 was one of the first six services of the Rhine-Main S-Bahn system. In a prior test operation it ran between Kronberg and Frankfurt Central Station. The service was then called R4 where the letter "R" stands for regional. After the opening of the Frankfurt Citytunnel the service was renamed to S4 and extended to the new Hauptwache underground station. Further extensions of the tunnel followed in 1983 (Konstablerwache) and 1990 (Ostendstraße and Lokalbahnhof) so that the Südbahnhof (South station) became the service's eastern terminal.

Operation

 * 1) Kronberg – Langen
 * 2) Frankfurt Hbf – Langen
 * 3) Kronberg – Darmstadt Hbf (Sundays only)

{| class="wikitable" summary="Stations of the S4 service" ! colspan="3" align="center" scope="col" | ! colspan="2" | Journey time ! colspan="2" scope="col" | Station ! scope="col" | Transfer ! scope="col" | S-Bahn service since ! 1 ! 2 ! 3 ! colspan="6" | ! colspan="13" align="center" class="hintergrundfarbe5" |

Main-Taunus-Kreis
! colspan="13" align="center" class="hintergrundfarbe5" |
 * style="background-color:#006e34" | || ||style="background-color:#cef2e0" |
 * 0 ||
 * Wheelchair symbol.svg
 * Kronberg
 * 1978
 * style="background-color:#006e34" | || ||style="background-color:#cef2e0" |
 * 2 || +2
 * Wheelchair symbol.svg
 * Kronberg Süd
 * 1999
 * style="background-color:#006e34" | || ||style="background-color:#cef2e0" |
 * 5 || +3
 * Eschborn-Niederhöchstadt
 * 1978
 * style="background-color:#006e34" | || ||style="background-color:#cef2e0" |
 * 7 || +2
 * Eschborn
 * 1978
 * style="background-color:#006e34" | || ||style="background-color:#cef2e0" |
 * 9 || +2
 * Wheelchair symbol.svg
 * Eschborn-Süd
 * 1978
 * 7 || +2
 * Eschborn
 * 1978
 * style="background-color:#006e34" | || ||style="background-color:#cef2e0" |
 * 9 || +2
 * Wheelchair symbol.svg
 * Eschborn-Süd
 * 1978
 * Wheelchair symbol.svg
 * Eschborn-Süd
 * 1978
 * 1978

Frankfurt am Main
! colspan="13" align="center" class="hintergrundfarbe5" |
 * style="background-color:#006e34" | || ||style="background-color:#cef2e0" |
 * 13 || +4
 * Frankfurt-Rödelheim
 * 1978
 * style="background-color:#006e34" | || ||style="background-color:#cef2e0" |
 * 16 || +3
 * Frankfurt West
 * 1978
 * style="background-color:#006e34" | || ||style="background-color:#cef2e0" |
 * 18 || +2
 * Wheelchair symbol.svg
 * Frankfurt Messe
 * 1999
 * style="background-color:#006e34" | || ||style="background-color:#cef2e0" |
 * 20 || +2
 * Frankfurt Galluswarte
 * 1978
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 23 || +3
 * Wheelchair symbol.svg
 * Frankfurt Hbf (tief)
 * 1978
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 25 || +2
 * Taunusanlage
 * 1978
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 27 || +2
 * Wheelchair symbol.svg
 * Hauptwache
 * 1978
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 28 || +1
 * Wheelchair symbol.svg
 * Konstablerwache
 * 1983
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 30 || +2
 * Ostendstraße
 * 1990
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 32 || +2
 * Frankfurt Lokalbahnhof
 * 1990
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 34 || +2
 * Wheelchair symbol.svg
 * Frankfurt South Station
 * 1990
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 36 || +2
 * Wheelchair symbol.svg
 * Frankfurt Stresemannallee
 * 1990
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 38 || +2
 * Wheelchair symbol.svg
 * Frankfurt Louisa
 * 1997
 * Ostendstraße
 * 1990
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 32 || +2
 * Frankfurt Lokalbahnhof
 * 1990
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 34 || +2
 * Wheelchair symbol.svg
 * Frankfurt South Station
 * 1990
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 36 || +2
 * Wheelchair symbol.svg
 * Frankfurt Stresemannallee
 * 1990
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 38 || +2
 * Wheelchair symbol.svg
 * Frankfurt Louisa
 * 1997
 * Wheelchair symbol.svg
 * Frankfurt Stresemannallee
 * 1990
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 38 || +2
 * Wheelchair symbol.svg
 * Frankfurt Louisa
 * 1997
 * Frankfurt Louisa
 * 1997
 * 1997

Kreis Offenbach
! colspan="13" align="center" class="hintergrundfarbe5" |
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 41 || +3
 * Wheelchair symbol.svg
 * Neu-Isenburg
 * 1997
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 44 || +3
 * Wheelchair symbol.svg
 * Dreieich-Buchschlag
 * 1997
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 46 || +2
 * Wheelchair symbol.svg
 * Langen Flugsicherung
 * 2002
 * style="background-color:#006e34" | ||style="background-color:#cef2e0"| ||style="background-color:#cef2e0" |
 * 48 || +2
 * Langen
 * 1997
 * || ||style="background-color:#cef2e0"|
 * 51 || +3
 * Wheelchair symbol.svg
 * Egelsbach
 * 1997
 * Langen
 * 1997
 * || ||style="background-color:#cef2e0"|
 * 51 || +3
 * Wheelchair symbol.svg
 * Egelsbach
 * 1997
 * Wheelchair symbol.svg
 * Egelsbach
 * 1997
 * 1997

Kreis Darmstadt-Dieburg
! colspan="13" align="center" class="hintergrundfarbe5" |
 * || ||style="background-color:#cef2e0"|
 * 53 || +2
 * Wheelchair symbol.svg
 * Erzhausen
 * 1997
 * 1997
 * 1997

Darmstadt

 * || ||style="background-color:#cef2e0"|
 * 55 || +2
 * Darmstadt-Wixhausen
 * 1997
 * || ||style="background-color:#cef2e0"|
 * 57 || +3
 * Wheelchair symbol.svg
 * Darmstadt-Arheilgen
 * 1997
 * || ||style="background-color:#cef2e0"|
 * 61 || +3
 * Wheelchair symbol.svg
 * Darmstadt Hbf
 * 1997
 * }
 * || ||style="background-color:#cef2e0"|
 * 61 || +3
 * Wheelchair symbol.svg
 * Darmstadt Hbf
 * 1997
 * }
 * }