Yes, you can use a Eurail Pass on nearly all trains operated by Italy's national railway, Trenitalia, but it is not always a "hop-on" experience. While the pass covers the fare for high-speed trains like the Frecciarossa and Frecciargento, as well as EuroCity and InterCity trains, these services require a mandatory seat reservation that must be purchased separately (typically costing €10 to €13). For regional trains (Regionale), no reservation is needed—you simply add the journey to your digital pass and board. The pass is not valid on the privately-owned Italo high-speed trains. In 2026, travelers must use the Rail Planner App to activate their pass and generate a QR code for each journey before boarding; failing to do so, or boarding a high-speed train without a reservation, can result in a significant on-the-spot fine from Italian ticket inspectors.