FS Class E.421

The FS Class E.421 locomotive of the Italian State Railways (FS) was a battery electric locomotive, built as a single unit (E.421.1) and used for shunting at the old Milan Central railway station. It was the only battery electric locomotive to be registered in the FS fleet.

FS class E.421
FS class E.421
Type and origin
Power typeElectric
BuilderCarminati & Toselli and TIBB
Build date1921
Total produced1
Specifications
Configuration:
​
 • UICBo′Bo′
Gauge1,435 mm (4 ft 8 1⁄2 in) standard gauge
Wheel diameter1,040 mm (40.94 in)
Length11.325 m (37 ft 1 7⁄8 in)
Loco weight64 t (63.0 long tons; 70.5 short tons)
Electric system/sBattery electric
Traction motorsDC
Performance figures
Maximum speed25 km/h (16 mph)
Power output140 kW (190 hp) continuous
Career
OperatorsFS

History

The E.421 locomotive was built by Carminati & Toselli in 1921, with electrical equipment by Tecnomasio Italiano Brown Boveri (TIBB). The batteries were built by Società Generale Italiana Accumulatori. The batteries were housed in the two bonnets. They weighed 30 tons and supplied electric power at a voltage of 450 V, which operated the four traction motors, one for each axle. The E.421 was used for shunting at the old central station of Milan, particularly in the western area, terminus of the Varese railway, which was electrified with a third rail. It was withdrawn from the service after only two years, in 1923, owing to its onerous maintenance requirements and short operating period - about one hour between charges.

It was stored for a few years, and there was a proposal to convert it to third rail operation, but this was not implemented. The E.421 was scrapped around 1935.

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References
    • Giovanni Cornolò, Locomotive elettriche FS, Parma, Ermanno Albertelli Editore, 1994, pp. 17-20, ISBN 88-85909-97-3.
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