FS Class E.550

The FS Class E.550 was a class of three-phase electric locomotive used in Italy, introduced in the 20th century, which remained in service until 1965.

In the wake of the success met by three-phase electric locomotives on the Valtellina line, in the early 20th century the newly formed state-owned Ferrovie dello Stato, led by Riccardo Bianchi, decided to electrify the important mountain line of the Giovi Pass as well, which connected the port of Genoa to the industrial cities of northern Italy. The decision was taken because the line was close to full saturation despite the use of the powerful 470 class steam locomotives. Electrification of the line at 3,400V, 15.8 Hz was completed in 1916.

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