Just show the card or NFC device used to access the turnstiles. The ticket inspector will simply check the card number. If you are aboard a Cotral vehicle you must necessarily have downloaded the Atac tap & go ® application (only on Andorid devices equipped with NFC technology) and show it to the inspectors. At the moment you cannot use tap & go ® on Trenitalia trains.

Remember to travel within the validity limits of your ticket.