I was looking up train tickets on the Railjet website, and I searched for what identification I need to show when I board a train with tickets purchased on-line. I couldn't find it, so I e-mailed Railjet about my inquiry, and they never responded. My presumption is that Railjet is similar to Deutsche Bahn, in that I would have to show Railjet the credit card that I used to make the purchase (even if that credit card is not valid on the actual travel date). Is that accurate? Is their any other identification they accept for non-EU (American) citizens?
Any input would be appreciated.