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ALCO DL420

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ALCO DL420 (S-5 prototype)
Type and origin
Power typeDiesel-electric
BuilderALCO
ModelS-5
Specifications
Configuration:
 • AARB-B
Gauge4 ft 8+12 in (1,435 mm)
Performance figures
Power output800 hp (600 kW)

The ALCO DL420 was the prototype ALCO S-5 diesel-electric switcher locomotive.

It was built in August, 1951 using an early six-cylinder 251 engine rated at 800 horsepower (600 kW) and RS-3 subassemblies in its construction. It rode on two-axle trucks with a B-B wheel arrangement, and was the first ALCO switcher with a front radiator opening. This one-of-a-kind unit spent its time at the Niskayuna test facility, then at Schenectady as a shop switcher (#6). It was scrapped in the late 1950s.

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