Varies per country=-there is a list of companies that accept passes-somewhere in the country info. But for the rough trip from GB -via FR-ES to PT about all is included-but for the nitpickers-not each&every train on some pars of this route.

THis 92€ is only the extra you have to pay on top of pass-IF you are even successfull in getting the seats for that price (several are needed). YOu can lower it by leaving most of the his-peed trains aside=makes the trip much longer in time, but you get to see more and the stress is also less.

NOte: that for now, and most certainly in summer/hi-season this is a by now near impossible route to do on a pass-and again you have chosen 2 out 3 of the most difficult countries to use it. This is becse of the needed REServ on top-also the effort you need to do to get them GB has just 1 train going out of this funny island-and this €* is nearly fully booked already. It seems that each&every newbee wants to use the direct TGV FRance-ESpana=same fate (can be avoided as above-use local trains). Connections ES-PT are very scarce and time eating. Read also seat61.com for general advice and overview.

Hi, it is not possible to buy one ticket from UK to Portugal. Most of the time only Eurostar costs about 100-200 EUR € one way. The Interrail Reservation only 30€ on top of the pass. Then about 35€ Paris to Barcelona and from there no direct service to Portugal, but with some changes. Not really possible in one day.