You can use your Eurail Pass for journeys to and from Rome, as well as for regional travel within the Lazio region on Trenitalia-operated trains, but it is generally not a good "value" for city-internal transit. The Eurail Pass covers all national (Trenitalia) and high-speed (Frecciarossa) rail services that stop at major hubs like Roma Termini and Roma Tiburtina. For example, you can use it to take a day trip to Florence or Naples. However, the Eurail Pass is not valid on Rome's city-run "ATAC" network, which includes the Metro (Line A, B, and C), city buses, and trams. If you use a "travel day" on your pass just to take a short commuter train within Rome, you are likely wasting a high-value day that could be worth 50 to 100 on a 1.50€ ticket. Most travelers in Rome buy a separate "BIT" ticket or use a contactless credit card for the Metro and buses, saving their Eurail Pass for the expensive high-speed "Le Frecce" journeys where you will also need to pay a separate 10€ to 13€ seat reservation fee despite holding the pass.