Never heard of the SBB vending machines to reject a card. Try to get some CHF cash, normally at any train station the staff should be able to help… BTW at the SBB machines it’s possible to buy BTC 😂 

 That’s the thing, I’m in NC right now. I’m trying to buy my train tickets for when I get there. 

 Get some cash at the airport and buy when you’re there… Buying train tickets shortly before your ride shouldn’t be a problem… Else, try downloading the SBB app & try to buy within the app….