S4 (Rhine-Main S-Bahn)

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 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.

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

			Journey time		Station		Transfer	S-Bahn service since
1	2	3
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
			13	+4		Frankfurt-Rödelheim		1978
			16	+3		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
			34	+2		Frankfurt South Station		1990
			36	+2		Frankfurt Stresemannallee		1990
			38	+2		Frankfurt Louisa		1997
Kreis Offenbach
			41	+3		Neu-Isenburg		1997
			44	+3		Dreieich-Buchschlag		1997
			46	+2		Langen Flugsicherung		2002
			48	+2		Langen		1997
			51	+3		Egelsbach		1997
Kreis Darmstadt-Dieburg
			53	+2		Erzhausen		1997
Darmstadt
			55	+2		Darmstadt-Wixhausen		1997
			57	+3		Darmstadt-Arheilgen		1997
			61	+3		Darmstadt Hbf		1997

Wikimedia Commons has media related to S4 (S-Bahn Rhein-Main).

• traffiQ Frankfurt – S3/S4 timetable