FS class E.620
Type and origin Power type Electric Builder Officine Reggiane Build date 1925 Total produced 5
Specifications Configuration: ​  • UIC Co+Co Gauge 1,435 mm (4 ft 8+1⁄2 in) standard gauge Wheel diameter 1,050 mm (41.34 in) Length 11.77 m (38 ft 7+3⁄8 in) Loco weight 54 t (53.1 long tons; 59.5 short tons) Electric system/s 650 V DC third rail Traction motors 6
Performance figures Maximum speed 85 km/h (53 mph) Power output 950 kW (1,270 hp) continuous
Career Operators Ferrovie dello Stato Italiane

The FS Class E.620 was a class of third-rail electric locomotives built by Officine Meccaniche Reggiane for the Italian State Railways (FS). They were built in 1925 using motors and electrical equipment from Class E.10 ^[it] railcars which had been withdrawn in 1923. After World War II they were converted to 3,000 volt DC operation and became FS Class E.621.

They were equipped with six nose-suspended direct current traction motors with a total output of 950 kW (1,270 hp). This power was transferred to the axles via a geared final drive and through this they had a maximum speed of 85 km/h (53 mph). They received power from a 650 V DC third rail system, with the traction current being picked up by contact shoes.

• Nuovi locomotori per la linea Milano-Varese-Porto Ceresio, in "Rivista tecnica delle ferrovie italiane", anno XV, vol. XXIX, n. 1 (15 gennaio 1926), pp. 1–3.
• Cornolò, Giovanni; Pedrazzini, Claudio (2011) [1983]. Locomotive elettriche FS. Parma: Ermanno Albertelli Editore. ISBN 9788895096056.
• Garzaro, Stefano (1986). Locomotive elettriche FS. Elledi. ISBN 8876490418.
• Cornolò, Giovanni (1994). Locomotive elettriche FS. Parma: Ermanno Albertelli Editore. pp. 43–45. ISBN 978-8885909977.