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Eurail/Interrail infos:

If you're booking your journey in advance then buy your tickets directly on thetrainline.com for example.

If you buy the pass and use it to make early reservations (as the eurail advises on their website) the overall cost of the pass+reservations will be more than buying tickets directly, plus, you will be treated as a suspect second class citizen with your reservation marked as "Must Show Pass". Another cons to Eurail/Interrail pass when making a reservation is that you have no way to choose your seat. I was always attributed the worst seats when I used it : usually in the 4-block seats facing strangers (often families with children).

If you try to use the pass few days earlier to your journey on high speed trains in Europe, well it says No Seats Available for pass holders. So in all cases the pass isn't worth it neither when booking early nor lately.

My advice is to book the tickets for all your journeys in advance while having a complete control on your attributed seats and saving money.

keywords: London, Paris, Eurostar, Eurotunnel, Channel tunnel, Train