From the Rome Ostiense Station (FM3): Rail link every 30 minutes during the day on the FM3 line to Viterbo or Bracciano (around 50 min) - do not take the train to Cesano - also stops at the Valle Aurelia rail/underground interchange.
From the Roma Termini Station:Take the underground (line B, direction Laurentina) and get off at Piramide. Then go to the Roma Ostiense rail station, which is connected to the Piramide station by an internal passage, and take the train on the FM3 line to Viterbo or Bracciano (around 50 min) - do not take the train to Cesano. Departures during the day: every 30 minutes.