What should I bear in mind when travelling by train in the Netherlands?

Please note the following information when travelling with a Dutch Railways (NS) ticket:

• Tickets must be printed on A4 paper before departure.
• Many stations in the Netherlands have ticket barriers at the entrance to the platform area. Use the ticket’s barcode to open the barriers.
• The following trains require a supplement: IC Direct/Eurocity Direct services between Schiphol Airport and Rotterdam Centraal and ICE services between any two stations within the Netherlands. You can purchase the supplement in the Netherlands from a ticket machine or, where applicable, on the platform at specially marked posts.