I'm US resident and I bought Eurail Regional Pass (Scandinavia) for my travel to Europe. I need to make reservation for one of the trains, and it looks like it's cheaper if I book it from raileurope.co.uk. So, I had one of my friends book that reservation who lives in UK and he is also traveling with me (using his InterRail Pass). Now, my question is: Is that reservation valid only with InterRail pass?? Or, it does not matter as long as I have valid pass to travel in train?
Thanks in advance