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S5 (Rhine-Main S-Bahn)

S5
Frankfurt S5.svg
S5 Kirdorfer-Bach-Viadukt ET423.jpg
S5 crossing a viaduct in Bad Homburg
Overview
Type Rapid transit, Commuter rail
System S-Bahn Rhein-Main
Status Operational
Locale Frankfurt Rhine-Main
Termini Friedrichsdorf
Frankfurt South
Stations 17
Services Homburg Railway, Citytunnel Frankfurt
Line number 5
Operation
Opened 28 May 1978 (1978-05-28)
Owner Rhein-Main-Verkehrsverbund
Operator(s) DB Regio
Depot(s) Frankfurt Hbf
Rolling stock DBAG Class 423
Technical
Line length 28.9 km (18.0 mi)
Track gauge 1,435 mm (4 ft 8 12 in) standard gauge
Electrification Overhead line
Route number 645.5

The S5 service of the S-Bahn Rhein-Main system bearing the KBS (German scheduled railway route) number 645.5

The Homburg Railway connects Frankfurt Central Station with Friedrichsdorf, via Bad Homburg. It was opened on 10 September 1860 and electrified on 26 September 1970. S-Bahn services commenced on the line on 25 September 1977.

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.

The S5 was one of the first six services of the Rhine-Main S-Bahn system. In a prior test operation it ran between Friedrichsdorf and Frankfurt Central Station. The service was then called R5 where the letter "R" stands for regional. After the opening of the Frankfurt Citytunnel the service was renamed to S5 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.


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