If you have a 2nd class ticket (incl. Tell-Pass or Swiss Travel Pass 2nd class), you must buy an upgrade for 1st class. You can buy the upgrade either at the ticket counter at the station or directly on the train.
If you have a 2nd class ticket (incl. Tell-Pass or Swiss Travel Pass 2nd class), you must buy an upgrade for 1st class. You can buy the upgrade either at the ticket counter at the station or directly on the train.