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ALCO DL420 (S-5 prototype)
| Power type |
Diesel-electric |
| Builder |
ALCO |
| Model |
S-5 |
| AAR wheel arr. |
B-B |
| Gauge |
4 ft 8½ in (1,435 mm) |
| Power output |
800 hp |
The ALCO DL420 was the prototype ALCO S-5 switcher diesel-electric locomotive.
It was built in August, 1951 using an early six cylinder 251 engine rated at 800 horsepower and RS-3 subassemblies in its construction. It rode on two-axle trucks, having 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 and then at Schenectady as a shop switcher (#6). The unit was scrapped in the late 1950s.
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