There are no ICEs between Zurich and Geneva. Intercity trains run every 30 min:
- IC1: looooong double-decker train along the plains and gentle hills
- IC5: fun tilting train along the plains and 3 lakes
Seat reservations are not a thing/useless in Switzerland. Nobody makes them. Lived here all my life and never made one haha
Hop on and sit wherever you want. The front/rear ends are always less busy as people are lazy and board in the middle near the stairs. :)
That's reassuring because I was wondering if we were going to end up sitting on our suitcases for 3 hours ;)
And yes, I'm sorry, it's the IC I wanted to talk about!
No worries. I’d suggest using the SBB app, it’ll show platforms, train formations, how busy the train is expected to be, etc.
If you see that there is a single unit on IC5 (7 carriages) the train might be busy then. In that case switch to IC1: 2 x 8 carriages with over 1200 seats.
In any case don’t worry too much and go with the flow.