The S4 is a railway service of RER Vaud that provides hourly service between Allaman and Palézieux in the Swiss canton of Vaud. On weekdays, rush-hour services continue from Palézieux to Romont, in Fribourg. Swiss Federal Railways, the national railway company of Switzerland, operates the service.

S4
A Palézieux-bound S4 at Grandvaux in 2009
Overview
First service	12 December 2004 (2004-12-12)
Current operator(s)	Swiss Federal Railways
Route
Termini	Allaman Romont
Stops	13
Distance travelled	61.7 kilometres (38.3 mi)
Average journey time	48 minutes (Allaman–Palézieux) 18 minutes (Palézieux–Romont)
Service frequency	Hourly
Line(s) used	Lausanne–Geneva line Lausanne–Bern line
Route map Legend S20 S21 to Fribourg 40.2 Romont S4 S20 S21 Regional services to Bulle 30.5 Vauderens 24.4 Oron S8 S9 to Payerne 20.6 Palézieux S6 S8 S50 S50 to Bulle 14.6 Moreillon 12.1 Puidoux S7 S7 to Vevey 8.3 Grandvaux 4.0 La Conversion 2.4 Pully-Nord S2 S5 to Vevey 0.0 0.0 Lausanne S1 S3 S6 S9 S22 4.5 Renens VD S1 S2 S5 S22 to Cossonay-Penthalaz 12.5 Morges Regional services to Bière 16.9 St-Prex 19.4 Etoy 21.5 Allaman S3 S4 Regional services to Genève-Cornavin [1][2] This diagram: view talk edit

Operations

The S4 operates every hour between Allaman and Palézieux, using the Lausanne–Geneva line between Allaman and Lausanne and the Lausanne–Bern line between Lausanne and Romont, via Palézieux. The S4 runs as an express between Morges and Lausanne, stopping only at Renens VD. It is paired with the S3 between Allaman and Lausanne, providing half-hourly service between the two cities. Between Lausanne and Palézieux it operates with the S6, S9, and InterRegio 15; combined there is service over the line roughly every 15 minutes. Northeast of Palézieux, the S4 operates to Romont during weekday rush-hour only. It is the only stopping service for Oron and Vauderens.[3][4]

History

The S4 was one of the six original lines of the RER Vaud, then called the Vaud Express Network (French: Réseau express vaudois, REV), when that system was established in December 2004. It ran hourly between Morges and Palézieux.[5] SBB extended the S4 west from Morges to Allaman with the December 2011 timetable change, making local stops.[6] Rush-hour service to Romont began on 10 December 2017.[7] In December 2021, SBB increased the number of rush-hour round-trips between Allaman and Romont from three to six.[8]

References

External links

Wikimedia Commons has media related to S4 (RER Vaud).

• 2022 timetable: Allaman–Lausanne and Lausanne–Romont