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In page Eurostar:

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Eurostar is not permitted to carry passengers on London services for journeys within one country, so passengers cannot travel (for example) from Lille to Marne-la-Vallée–Chessy, London to Ashford, or Rotterdam to Amsterdam on a London service.[citation needed] Lille to Brussels is the only international intra-Schengen journey that Eurostar is offering for sale on London services.[1]