S1 (Rhine-Main S-Bahn)

S1
S1 in Hochheim, bound for Wiesbaden
Overview
Status	Operational
Owner	DB Netz
Locale	Frankfurt Rhine-Main
Termini	Wiesbaden Hauptbahnhof Rödermark-Ober Roden
Stations	32
Service
Type	S-Bahn Rhein-Main (Rapid transit, Commuter rail)
Services	Taunus Railway Main-Lahn Railway Citytunnel Frankfurt Frankfurt Schlachthof–Hanau railway Rodgau Railway
Route number	645.1
Operator(s)	DB Regio
Rolling stock	DBAG Class 430
History
Opened	28 May 1978 (1978-05-28)
Technical
Line length	72.1 km (44.8 mi)
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Electrification	Overhead line

The S1 service of the S-Bahn Rhein-Main system bearing the KBS (German scheduled railway route) number 645.1 is an important railway connection running east–west. It operates between the Hesse state capital Wiesbaden and the southern Offenbach rural district serving the densely populated area along the Main river.

With a route length of over 70 km (43 mi), 30 stations and a journey time of 87 minutes, it is the longest S-Bahn service in the Rhine-Main area. The average speed of travel is about 49.72 km/h (30.9 mph) and a station distance of about 2 km (1.2 mi).

Usually DBAG Class 423 railcars are used on this service. Its predecessor class 420 is only used for shortened shuttle services.