I am going to take the inter-city trains from the Brussels airport to Amsterdam. For convenience I bought the ticket online and printed it out; however it says it is good for any train on the route that day, not a specific train/seat. I know in Italy you need to validate tickets like this in the yellow boxes by the track; however I haven't been able to find anything online about Belgium. Does someone who had taken trains in Belgium know if the tickets need to be stamped in some machine, and if so what they look like?
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