Hello Tadaitau80
Good day!
Given the fact that the Swiss Travel Pass is your valid train ticket, why would you need another ticket?
An additional ticket would only be needed if you were about to
- upgrade your 2nd class Swiss Travel Pass to 1st class or
- use your Swiss Travel Pass to places beyond its validity, for example to places where it does not (fully) cover public transit services.
In addition, our public transit system features free seating, there are no assigned seats when booking a ticket.
For now, simply board the train and show the Swiss Travel Pass together with your physical passport (no paper copy, no photo on smart phones) when being ask to show tickets.
Does that make sense?
Kind regards,
Roland