In 2026, you generally do not need to print your Eurail seat reservations, as most European rail operators have fully transitioned to digital "E-tickets." When you book a reservation through the Eurail app or an operator's website (like SNCF or DB), you receive a QR code that can be scanned directly from your smartphone. However, there are a few critical exceptions: some older "cross-border" night trains or specific routes in Eastern Europe (such as parts of Poland or Romania) still require physical paper reservations. If the booking system states that the ticket will be "sent by mail," you must have that physical document. A good rule of thumb for 2026 is to keep a digital PDF copy of your reservation offline on your phone, but unless you are traveling on a very specific legacy route, the digital version in your Eurail Rail Planner app is all the conductor needs to see.