| ALCO S-5 |
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B&M S-5 #864 in Boston in September 1965 |
| 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 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).
