I am getting into Rome by air and want to get on train to Naples a few hours after arrival. How do I get a train ticket or reservation before I leave the US.
Many answers already on your other posting, but for buying online in advance, read this article on Booking on the Trenitalia Website . For info on currently the best discount ticket you can buy in advance, read the Trenitalia MINI promotion. And if you wait until you arrive, as perhaps your credit card does not work, you can still get MINI discounts before the day of travel, and Buy your Train Ticket at a kiosk.