Treno Napoli 11:50 to Roma 13:00
One hour and five minutes scheduled trip time. The first class carriages on these trains are clean and comfortable.
The seats are wide, they feel wider than the DB ones in Germany.
There is complimentary drinks and snacks served during the trip. The trip on the express from Napoli to Roma takes around 1 hour.
One suggestion would be for Eurail ticket holders to make any reservations they need at at smaller stations before getting to Roma or after leaving Roma. Whenever we passed the ticket reservations office in Roma Termini the queues were long.