ALCO S-5
ALCO S-5
Type and origin |
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Power type |
Diesel-electric |
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Builder |
ALCO |
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Serial number |
80915–80921 |
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Model |
S-5 (Specification DL421 and DL421A) |
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Build date |
June 1954 |
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Total produced |
7 |
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Performance figures |
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Power output |
800 hp (600 kW) |
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The Alco S-5 (DL 421A) was a diesel-electric locomotive of the switcher type rated at 800 horsepower (600 kW), that rode on two-axle trucks, having a B-B wheel arrangement.
This was Alco's second attempt to build a replacement 251-engined switcher to replace the 539-engined S-3 and S-4. Only seven were sold. The demonstrator unit was ALCO specification DL421 and the six production units were ALCO specification DL421A. Alco fitted the 251A engine in its replacement, the S-6 with power output raised by 100 horsepower (75 kW).
Original Owners
Railroad | Quantity | Road numbers | Notes |
Alco (demonstrator) | 1 | 909 | to Island Creek Fuel and Transportation Company #102 |
Boston and Maine Railroad | 6 | 860–865 | |
See also
External links