 It then continues, via the Pisa–Livorno–Rome railway east and south of Rome's city centre, to Roma Trastevere.Finally, it takes the Rome–Fiumicino railway to Fiumicino Aeroporto, in the "comune" of Fiumicino southwest of the city centre.The first FL1 services between Monterotondo-Mentana and Fiumicino Aeroporto went into operation during 1994, bringing about an increased frequency of services on the lines through Rome.