Greetings. We arrive in Vienna on July 21st and depart on Friday July 25th for Budapest. As it turns out, that is the beginning of the Formula 1 weekend in Budapest so things might be a bit crazy.
How likely is it that the trains will be full on the 25th and we will miss out if we do not pre-book a seat?
If we purchase a Railjet ticket online for on certain date & time, can that ticket be exchanged for another date and or time? So if we decided to leave in the 24th for some reason can we get credit for the purchased tickets? Or, if we buy a ticket for the 10:02 train i=on the 25th, could we decided to catch a later train if we choose?
I know that its a basic question and I did a search but I didn't come across this specify answer.