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| FS E.646 | |
|---|---|
| Name | E.646 |
| Powertype | Electric |
| Builder | Ansaldo, Breda, Officine Reggiane |
| Builddate | 1940s–1950s |
| Totalproduction | 225 |
| Uicclass | (1′Co)(Co1′) |
| Length | 19.91 m |
| Tractionmotors | 6 × DC motors |
| Maxspeed | 130 km/h |
| Operator | Ferrovie dello Stato |
| Disposition | preserved, withdrawn |
FS E.646
The E.646 was a class of Italian electric mainline locomotives operated by Ferrovie dello Stato in the mid-20th century. Conceived during the Second World War and produced in the postwar reconstruction era, the E.646 served passenger and freight services across Italy, linking hubs such as Milano Centrale, Roma Termini, Napoli Centrale, Torino Porta Nuova and Venezia Santa Lucia. Designed by Italian firms and built by manufacturers including Ansaldo, Breda, and Officine Reggiane, the type participated in modernization efforts paralleling developments at SNCF, Deutsche Reichsbahn, British Railways, and Deutsche Bundesbahn.
The E.646 program originated amid planning by Ferrovie dello Stato and the Ministry of Transport (Italy), influenced by earlier electric designs like the FS E.626 and contemporary trends from SBB-CFF-FFS, SBB electrification projects, and lessons from the Second World War. Prototype work involved collaboration with engineering firms tied to Ansaldo and industrial research institutes in Milan and Turin. Postwar reconstruction priorities under governments led by Alcide De Gasperi and ministries that followed accelerated production alongside infrastructure projects such as the electrification of lines connecting Genoa, Bologna Centrale, Palermo Centrale (via ferry connections), and the southern corridors to Bari Centrale and Reggio Calabria Centrale. The class entered service during the economic expansion associated with the Italian economic miracle and the infrastructure modernization linked to events like the 1955 Mediterranean Games in Barcelona and major exhibitions at Turin.
The E.646 featured a (1′Co)(Co1′) wheel arrangement with articulated bogies inspired by research from firms collaborating with Politecnico di Milano and engineering precedents seen on SBB and DRG prototypes. The locomotive used six series-wound DC traction motors controlled via rheostatic starting and multiple notching, with auxiliary systems compatible with regenerative aids tested by ENEL and electric research teams connected to CNR. The electrical equipment reflected standards set by Centro Studi Materiale e Trazione engineers and manufacturing by Ansaldo Trasmissioni and Breda Meccanica. The steel bodywork was produced by Officine Reggiane with components standardized in line with NATO-era supply chains linking manufacturers similar to Fiat Ferroviaria and Hitachi collaborations in later decades. Braking systems were air-operated with co-operative control for multiple-unit operation envisioned for coordination with FS coaching stock, and driver cabs incorporated ergonomic inputs from unions and staff representatives connected to CGIL.
Production runs were carried out in plants across Brescia, Pisa, Sesto San Giovanni, and Reggio Emilia, reflecting industrial concentrations associated with firms like Ansaldo and Breda. Deliveries enabled service deployment on trunk routes linking Milano Centrale–Napoli Centrale, Torino–Venezia Santa Lucia, and international ferry-linked services toward Trieste and cross-border connections with Austria and Switzerland. Units were used on prestigious named trains alongside carriages from Società Italiana Ernesto Breda builds and in tandem with FS electric multiple units on regional and express services serving stations including Firenze Santa Maria Novella, Padova, and Bologna Centrale. The fleet supported increasing postwar passenger traffic connected to events like the Expo 58 influence on European rail marketing and the growth of tourism to Amalfi Coast and Sicily destinations.
Throughout their careers, E.646 units underwent modifications inspired by operational needs and technological progress parallel to upgrades seen on locomotives at SNCF and DB. Some locomotives received updated control equipment compatible with multiple-working standards used on units from FS E.444 and braking improvements influenced by research at Istituto Nazionale di Ricerca Metrologica. Retrofit programs included cab refurbishments, improved lighting systems similar to those on Eurostar prototypes, and ballast and suspension adjustments derived from tests at Centro Sperimentale di Parma. Variant classifications emerged informally among staff; modifications paralleled national efforts such as electrification upgrades coordinated with ENEL and signaling enhancements linked to Rete Ferroviaria Italiana predecessors.
Operationally, the class excelled on mixed-traffic duties, balancing speed and tractive effort in roles comparable to contemporaries used by SBB, ÖBB, and SNCF during the same period. Acceleration profiles suited express timetables connecting Milano Centrale to Roma Termini, while sustained tractive effort allowed freight workings on gradients such as the Giovi Pass approaches and the southern Apennine routes to Napoli. Maintenance regimes were influenced by practices at workshops in Florence, Naples, and Bologna and documentation coordinated with FS technical departments. Incidents and operational records were reviewed by agencies including safety bodies and insurance partners tied to the Italian rail sector, informing later durability improvements that echoed standards later codified by UIC committees.
Following withdrawal from regular traffic, several units were preserved by entities such as railway museums and heritage groups affiliated with organizations like Fondazione FS Italiane and local historical societies in Pistoia, Verona, and Torino. Preserved locomotives appear at events celebrating Italian industrial heritage alongside exhibits about postwar recovery, often featured in publications and displays with comparisons to rolling stock preserved by National Railway Museum (York), Deutsches Technikmuseum, and Cité du Train. The E.646 has been commemorated in model form by manufacturers reflecting European railway modeling traditions tied to firms in Nuremberg and Milan and remains a subject of study at institutions such as Università di Bologna and Politecnico di Torino for students of railway engineering and industrial history.
Category:Italian electric locomotives