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B&M S-5 #864 in Boston in September 1965
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The Alco S-5 (DL 421A) was a diesel-electric switcher locomotive 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).
Railroad | Quantity | Road numbers | Notes |
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Alco (demonstrator) | 1 | 909 | to Island Creek Fuel and Transportation Company #102 |
Boston and Maine Railroad | 6 | 860–865 |
Media related to ALCO S-5 locomotives at Wikimedia Commons
Diesel-electric locomotives built by ALCO
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Switchers |
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RS, RSC and RSD series |
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Cab units |
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Century series |
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Diesel-hydraulics | |
Export locomotives |
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Unproduced locomotives |
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Diesel–electric switcher locomotives
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Alco |
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Baldwin |
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Fairbanks-Morse |
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GE |
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GM/EMD |
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Lima-Hamilton |
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National Railway Equipment |
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