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In page Thalys:

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Since 24 August 2010, there has been a supplement of €7 to Thalys (as well as other international high-speed tickets) tickets bought at SNCB/NMBS ticket offices at train stations (but not on tickets bought over the Internet). This is due to a reduction of a sales fee paid by Thalys and Eurostar to the Belgian rail company.[4] The sales prices have evolved, by June 2019, the "booking fee" (as it is referred to as) had risen to €9.[citation needed]