S22 (RER Vaud)

The S22 was a railway service of RER Vaud that provided rush-hour service between Lausanne and Le Brassus in the Swiss canton of Vaud. Swiss Federal Railways, the national railway company of Switzerland, operated the service.

Operations
The S22 operated two trains in each direction per day. Two trains departed Le Brassus in the morning and returned from Lausanne in the early evening. At the time, this is the only through service between the two cities; regular service between Le Brassus and Vallorbe was provided by Travys, with a change to other RER Vaud services at Vallorbe or Le Day.

History
SBB introduced the S22 with the December 2020 timetable change. The RER Vaud lines were substantially reorganized for the December 2022 timetable change. The "new" S4 replaced the S22, providing hourly service between Le Brassus and Aigle.