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I forgot to check in for my train ride

Some train stations do not have closed gates and it is easy to pass through and forget to check in. If you realise that you have forgotten to check in after walking past the gates, try to go back and do so before you enter the train. Otherwise the conductor may issue a fine because you do not have a valid ticket. Make sure that you check in at an NS pole, or at the check in side of the gate. Are you already on the train? Then report to the conductor.