We will be a party of four from Canada who will have Global Eurail passes, and plan to travel on a Eurostar from London to Brussels in August.

Three of us will begin using our passes in mid-July and the fourth will arrive in London from Canada a few days before we will travel to Belgium.

We know that time of year is busy and the number of seats available for 2nd class Eurail pass holders is limited.

Must our Eurail passes be activated before we can reserve tickets on the Eurostar?

Thank you for your help.