| FS Class E.321 (third rail) | |||||||||||||||||||||||||
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 E.321 electric locomotive at the Museum of Science and Technology in Milan | |||||||||||||||||||||||||
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FS Class E.321 was a class of 17 third-rail electric locomotives, built for the Italian State Railways (FS) for operation on the Varese line and on the underground line in Naples.
The E.321 was an evolution and improvement of the previous FS Class E.320. Seventeen units were built by Officine Meccaniche (OM) of Milan, with electrical equipment by Tecnomasio Italiano-Brown-Boveri (TIBB), from 1923 to haul heavy passenger trains on the electrified line of the Milan - Varese - Porto Ceresio railway and for use on the so-called "subway" of Naples.
The locomotive consisted of a single central box, following the typical design of the time, with cabs and control desks at each end. This was mounted on a rigid frame carried on three coupled axles with 1,500 mm driving wheels and a carrying axle on the typical Italian Zara bogie at each end. The wheel arrangement was 1′C1′. The electrical equipment was contained in the central body. Two direct current (DC) traction motors provided a total power of 1,450 kilowatts (1,940 hp) and the locomotive could reach a maximum speed of 95 km/h. [1]
The design was almost the same as the E.320, but addressed the fragility of the E.320's mechanical rod transmission. The two motors, of similar but slightly lower power rating, were now set lower in the frame. This allowed the previous arrangement of steeply inclined coupling rods to intermediate jackshafts to be replaced by a lighter triangular rod on each side, similar to that used on the Italian three-phase locomotives, and no longer needing the jackshafts. The total weight of the locomotive in working order was 69 tonnes, of which 48 tonnes was adhesive. This was nearly three tonnes lighter than the E.320 and yet there was nearly a ton more adhesive weight. [1]
They were painted in the typical khaki brown Castano-Isabella livery of Italian electric locomotives.
E.321.012 is preserved at the Museum of Science and Technology in Milan.
The British Railways Class D3/7 were a class of 0-6-0 diesel electric shunting locomotives built as LMS Nos. 7080–7119. The class were built from May 1939 through to July 1942 by the London, Midland and Scottish Railway at their Derby Works using a diesel electric transmission supplied by English Electric.
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The FS Class E.320 was a class of Italian third rail electric locomotive built between 1915 and 1918. Five units were built and they saw service on the Varese - Milan - Porto Ceresio line. They were powered by two direct current electric motors, designed by Tecnomasio Italiano-Brown-Boveri (TIBB), giving a maximum speed of 95 km/h. The final assembly and the mechanical design were by Officine Meccaniche (OM). At the time of their construction they were the most powerful direct current locomotives in the world. The transmission of the motion to the three axles was by connecting rods and these were subject to frequent breakages.
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FS Class E.333 was a class of electric locomotives of the Ferrovie dello Stato (FS), powered by three-phase alternating current, which were in service from 1923 to 1968. They were designed by Kálmán Kandó for hauling fast passenger trains. Having the same electrical equipment as the FS Class E.552 locomotives, they presented the same defects and had to be modified. After modification, they were able to carry out the services for which they were designed.
FS Class E.220 was a two-axle electric locomotive, powered by a third rail, built for operation on the Varese line of the Italian Rete Mediterranea and registered as RM 02. It was acquired by the Italian State Railways in 1918 and re-registered as 220.01. It remained a unique example.
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FS Class E.620 was a class of third-rail electric locomotives built by Officine Reggiane for the Italian State Railways (FS). They were built in 1925 using motors and electrical equipment from Class E.10 railcars which had been withdrawn in 1923. They were equipped with six nose-suspended direct current traction motors with a total output of 950 kW. The drive to the axles was by gears and the maximum speed was 85 km/h. After World War II they were converted to 3,000 volt DC operation and became FS Class E.621.
The FS Class E.621 was a class of five electric locomotives of the Italian State Railways (FS). They were rebuilt in 1947 from FS Class E.620, which was originally built in 1925. The main change was conversion from 650 V DC third rail to 3,000 V DC overhead line power supply.
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