Hopefully a quick question (having a hard time understanding while booking / googling this point): I have a Swiss Travel Pass, and just paid for seat reservations in 1st class for the Golden Pass Express train (also 1st class in the Belle Epoch route).
Do I need to buy a class upgrade for each route (in addition to what I already paid for the seat reservation), or does the Swiss Travel Pass cover 1st class already and I'm all set with just the seat reservation costs?
Thanks!