| ALCO S-6 |
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SP No. 1231 at El Centro, California, in 1970 |
| Type and origin |
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| Power type | Diesel |
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| Builder | ALCO |
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| Model | S-6 |
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| Build date | May 1955–December 1960 |
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| Total produced | 126 |
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| Specifications |
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Configuration:
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| • AAR | B-B |
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| • UIC | Bo′Bo′ |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) |
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| Length | 45 ft 5 in (13.84 m) |
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| Width | 10 ft (3.05 m) |
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| Height | 14 ft 8 in (4.47 m) |
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| Loco weight | 230,000 lb (104.3 tonnes) |
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| Fuel capacity | 635 US gal (2,400 L; 529 imp gal) |
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| Lubricant cap. | 140 US gal (530 L; 120 imp gal) |
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| Coolant cap. | 110 US gal (420 L; 92 imp gal) |
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| Sandbox cap. | 26 cu ft (0.74 m3) |
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| Prime mover | ALCO 6-251A or B |
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| RPM range | 375–1000 rpm |
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| Engine type | Four-stroke diesel |
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| Generator | GE GT-533 (or GE GT-584) |
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| Traction motors | 4 × GE 731 (GE 752 optional) |
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| Cylinders | Straight 6 |
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| Cylinder size | 9 in × 10+1⁄2 in (229 mm × 267 mm) |
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| Performance figures |
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| Maximum speed | 60 mph (97 km/h) |
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| Power output | 900 hp (670 kW) |
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The Alco S-6 (specification DL 430) was a diesel–electric switcher locomotive constructed by ALCO of Schenectady, New York; a total of 126 locomotives were built between May 1955 and December 1960. The S-6 was an improved version of the earlier S-5.
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