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.
The route also included hourly trains between Orte and Monterotondo-Mentana.
Until 2000, the FL1 route divided into two sections near Fiumicino: one train in every four branched off to Fiumicino Città, while the remaining services headed towards Fiumicino Aeroporto.
Upon the introduction of the new timetable in 2000, the Fiumicino Città station was officially closed.
The FL1 route is designated in Trenitalia official timetables as M70 Orte–Fara Sabina–Fiumicino FR1.
As of 2012[update], FL1 services operated between Fara Sabina and Fiumicino every 15 minutes. As some FL1 services originated or terminated in Fara Sabina or Poggio Mirteto, the FL1 trains ran between Fara Sabina and Poggio Mirteto every 30 minutes, and linked Poggio Mirteto and Orte every 60 minutes.[2]