The FL4 (until 2012 FR4) is a regional rail route. It forms part of the network of the Lazio regional railways (Italian: ferrovie regionali del Lazio), which is operated by Trenitalia, and converges on the city of Rome, Italy.The route operates over the infrastructure of the Rome–Cassino–Naples, Rome–Albano, Rome–Frascati and Rome–Velletri railways. Within the territory of the comune of Rome, it plays the role of a commuter railway.
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