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.

In 2026, the short answer is no for almost all major rail networks, but there are critical exceptions. In the UK, EU (SNCF, Deutsche Bahn, Renfe), and the US (Amtrak), digital tickets (QR codes) on your smartphone or via the carrier's app are the standard. You can simply show the code to the conductor or scan it at the station gates. However, you should still print a physical copy if: 1) You are traveling in countries with less modernized infrastructure, 2) You are using a multi-country rail pass (like certain Eurail versions) that specifically requires a printed "travel diary," or 3) Your phone battery is unreliable. In 2026, some "advance-purchase" tickets in Eastern Europe still legally require a printed voucher that must be exchanged for a physical ticket at the station. Always check your confirmation email for the phrase "Must be printed"; if it says "Mobile Ticket" or "Paperless," your phone is sufficient. Carrying a PDF backup in your cloud storage is a smart middle ground.