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

ALCO DL420 (S-5 prototype)
Type and origin Power type Diesel-electric Builder ALCO Model S-5
Specifications Configuration: ​  • AAR B-B Gauge 4 ft 8+1⁄2 in (1,435 mm)
Performance figures Power output 800 hp (600 kW)

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.

See also

• List of ALCO diesel locomotives
• List of MLW diesel locomotives

References

• Data from The American Locomotive Company A Centennial Remembrance by Richard Steinbrenner pp. 311-312 photo, 340 photo, 394 photos
• Rolf Stumpf's ALCO World website switcher specification page

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