ALCO S-5
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.
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 B&M S-5 #864 in Boston in September 1965 | |||||||||||||||
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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) | 909 | to Island Creek Fuel and Transportation Company #102 | |
| Boston and Maine Railroad | 860–865 | ||
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External links
- Sarberenyi, Robert. Alco S5, S6, and SSB9 Original Owners.
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