Official site of the public transport in Rome.
The website says:
Currently we manage all forms of collective mobility in the Metropolitan Area of Rome:
• surface vehicles: buses, trolleybuses, trams, electric vehicles;
• Metro lines;
• Regional railways;
• Park & Ride areas and metered on-street parking, to foster integration between public transport and private mobility;
Information and phone numbers about transport. Also, a metro and commuter train map.
Article dated 1/5/2010