Is the Eurostar included in my Eurail pass?
No, the Eurostar high-speed train connecting London with France and Belgium isn't included in the Eurail pass. However, Eurail travelers can get a discount known as the 'Pass holder' fare.
It's not possible to book the ‘pass holder’ fare online.
There are 2 ways to purchase a discounted Eurostar ticket:
Directly from Eurostar terminals
By calling the Eurostar booking center on +44 (0) 1233 617 575
All fares are subject to availability and the Eurail pass must be valid in France and/or Belgium.
Your Eurail pass does not have to be activated before you board the Eurostar train on your first trip.