| S22 | |
| Successor: | S4 |
| Formeroperator: | Swiss Federal Railways |
| Stops: | 17 |
| Journeytime: | 1 hour 30 minutes |
| Frequency: | Rush-hour service |
| Map State: | collapsed |
The S22 was a railway service of RER Vaud that provided rush-hour service between and in the Swiss canton of Vaud. Swiss Federal Railways, the national railway company of Switzerland, operated the service.
The S22 operated two trains in each direction per day. Two trains departed in the morning and returned from in the early evening. At the time, this is the only through service between the two cities; regular service between Le Brassus and was provided by Travys, with a change to other RER Vaud services at Vallorbe or .[1]
SBB introduced the S22 with the December 2020 timetable change.[2] 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 .[3]