Hellenic Railways Organisation
Greece's rail network is estimated to be at 2,548 km. Rail transport in Greece is operated by TrainOSE, a current subsidiary of the Ferrovie dello Stato Italiane after the Hellenic Railways Organisation had sold its 100% stake on the operator. Most of the country's network is standard gauge (1,565 km), while the country also has 983 km of narrow gauge. A total of 764 km of rail are electrified. Greece has rail connections with Bulgaria, North Macedonia and Turkey. A total of three suburban railway systems (Proastiakos) are in operation (in Athens, Thessaloniki and Patras), while one metro system, the Athens Metro, is operational in Athens with another, the Thessaloniki Metro, under construction.