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Questions about tickets and things that work like tickets: e-tickets, passes, passcards, smartcards, etc.
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Why do people scan their Intercity / Sprinter tickets twice (on entry and exit) in Amsterdam?
You can travel the NS train either by buying a single ticket, or by using an OV-chipcard (Dutch: "OV chipkaart").
If you buy a single ticket it doesn't matter.
If you travel with the OV-chipcard (as …