If your train has been cancelled you will be able to: - Use your ticket to travel on another train but no seat is guaranteed. - Exchange your booking for free for travel at a different time/date in the same travel class.
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If a train is cancelled (and that's what's happened here) you're entitled to take the next train that matches any restrictions on your ticket. So if your ticket is routed via a certain place, you must go that way, or if it's only valid on a certain train company, you must use that companies services.
If the train has been canceled ask for a refund free of charge until 30 days after the departure: Online through the form available on SNCF.com,By postal service adressed to Service Relation Client SNCF, 62 973 ARRAS Cedex 9.
In this case, you will almost certainly be directed to take the next train. Don't worry if you miss a following connection, you're covered all the way to your destination because of the cancellation (this also works for delays).
Compensation is based on the price of your ticket (excluding additional services), no matter what caused the delay. The amount of your refund2 is determined as follows: 30 minutes to 2 hours late: 25% of your ticket price. 2-3 hours late: 50% of your ticket price.
Generally, if you'd left enough time had the delay not happened, Eurostar will re-book you onto the next available service. If you're delayed getting to the Eurostar station by something other than a train, YMMV, so it's probably best to leave more time for that.
Generally speaking, most tickets are valid for a specific train only and cannot be used for any other service. However, some companies may offer flexible tickets that allow you to take an earlier or later service if available.
If you miss your connecting trainThis means you'll usually be permitted to travel on the next available train free of charge if your first train is delayed. They do not entitle you to a full refund of your order. You may need to show your tickets on later services as evidence of the delay.