What fire safety equipment is legally mandatory on board every commercial passenger coach in Switzerland?

1. One portable extinguisher of any type, even if it is not the unit specified in the coach approval
2. The approved extinguisher or suppression equipment specified for that coach's class and configuration, serviced within the required interval and kept accessible in its marked mounting
3. Only the engine-bay suppression system; no prescribed portable equipment needs to be checked
4. Equipment chosen solely by passenger capacity, without regard to the coach class or installed systems