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S4
S4 at Frankfurt West station, bound for Kronberg
Overview
Status	Operational
Owner	Rhein-Main-Verkehrsverbund
Line number	4
Locale	Frankfurt Rhine-Main
Termini	Kronberg Frankfurt Süd
Stations	22
Service
Type	Rapid transit, Commuter rail
System	S-Bahn Rhein-Main
Services	Kronberg Railway Homburg Railway Citytunnel Frankfurt Frankfurt Schlachthof–Hanau railway
Route number	645.4
Operator(s)	DB Regio
Depot(s)	Frankfurt Hbf
Rolling stock	DBAG Class 423
History
Opened	28 May 1978 (1978-05-28)
Technical
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Electrification	Overhead line

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

Routes

Kronberg Railway

Homburg Railway

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 – Frankfurt Süd

	Journey time		Station		Transfer	S-Bahn service since
1
Main-Taunus-Kreis
	0			Kronberg		1978
	2	+2		Kronberg Süd		1999
	5	+3		Eschborn-Niederhöchstadt		1978
	7	+2		Eschborn		1978
	9	+2		Eschborn-Süd		1978
Frankfurt am Main
	12	+3		Frankfurt-Rödelheim		1978
	16	+4		Frankfurt West		1978
	18	+2		Frankfurt Messe		1999
	20	+2		Frankfurt Galluswarte		1978
	23	+3		Frankfurt Hbf (tief)		1978
	25	+2		Taunusanlage		1978
	27	+2		Hauptwache		1978
	28	+1		Konstablerwache		1983
	30	+2		Ostendstraße		1990
	32	+2		Frankfurt Lokalbahnhof		1990
	33	+1		Frankfurt South Station		1990

External links

• RMV Frankfurt – S3/S4 timetable

v t e Rhine-Main S-Bahn
Services
Routes	Frankfurt City Tunnel Offenbach City Tunnel Frankfurt Airport loop Frankfurt Schlachthof–Hanau railway Homburg Railway Kronberg Railway Limes Railway Main Railway Main-Lahn Railway Main-Neckar Railway Main–Weser Railway Offenbach-Bieber–Dietzenbach railway Mannheim–Frankfurt railway Rodgau Railway Taunus Railway

• Rhine-Main S-Bahn