Getting on the train with InterRail pass

[FullOfDoom]

We're going next week, st Pancras to Paris then Paris to Barcelona. All reservations made. Me, dh, dd13 and Ds 11.

My question is do we just jump on a train with our passes/reservation slip or do we have to queue up at the ticket office.

Any advice for newbies appreciated.

If you've got your passes you just hop on! The only person who didn't know what they were doing with ours was on Northern Rail on the first part of our journey to London but he took my word for it.

Thank you so much, glad we get to avoid the queuing.

That's on the normal trains so at Paris you won't have to - everyone has to queue for Eurostar though, you get like an equivalent to a boarding pass then go through security.