S4 (Rhine-Main S-Bahn)

S4
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
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

Year	Stations	Route
1974 (R4)	6	Kronberg – Frankfurt Hbf
1978	10 (+4)	Kronberg – Hauptwache
1983	11 (+1)	Kronberg – Konstablerwache
1990	14 (+3)	Kronberg – Frankfurt Süd
1997	19 (+5)	Kronberg – Langen
1999	21 (+2)	Kronberg – Langen
2002	22 (+1)	Kronberg – Langen
2024	16 (-6)	Kronberg – Frankfurt Süd

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

Kronberg – Frankfurt Süd

	Journey time			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