It is recommended, but not required, to print out an updated copy of your eTicket (or obtain a new copy from a ticket agent or an Amtrak kiosk) after you have modified your itinerary.
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Pros and cons of mobile + digital event ticketsDigital tickets are delivered via email and can be printed out or shown on a device at the event. Mobile tickets are similar to digital tickets, but they're specifically designed to be displayed on a smartphone.
When you attend events you'll need to display your tickets on your mobile phone. Your barcode includes technology to protect it, so you won't be able to use screenshots or print outs.
The RDG later confirmed that screenshots of tickets may be accepted as valid tickets if the barcode can be validated by an inspector using a scanner, but it said this is not recommended as it increases the chances of the ticket becoming obscured and unreadable.
Starting from September 30, 2023 Trenitalia will slowly introduce a mandatory CHECK IN policy for Regional Train ticket holders. As a result, any regional train tickets specifying NOT VALID TO TRAVEL will require a CHECK IN to be performed which would be a process to validate the tickets for usage.