Southern Pacific class AC-3
| Southern Pacific class AC-3 |
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| Type and origin |
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| Power type |
Steam |
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| Specifications |
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| Gauge |
4 ft 8 1⁄2 in (1,435 mm) |
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| Driver diameter |
57 in |
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| Weight on drivers |
440,800 lb |
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| Locomotive weight |
481,200 lb |
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| Boiler pressure |
210 psi |
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| Feedwater heater |
4¼-BL Worthington |
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| Cylinder size |
22 in dia × 30 in stroke |
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| Performance figures |
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| Tractive effort |
90,940 lbf |
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| Career |
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| Operator(s) |
Southern Pacific Railroad |
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| Class |
AC-3 |
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| Number in class |
20 |
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| Number(s) |
4029 – 4048 |
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| Retired |
1948 – 1949 |
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| Disposition |
scrapped |
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Southern Pacific Railroad's AC-3 class of steam locomotive was the last cab forward design based on the 2-8-8-2 wheel arrangement. All 20 locomotives in this class were rebuilds from MC-6 class locomotives originally built by Baldwin Locomotive Works in 1912 and 1913. The rebuilds all took place in the late 1920s at Southern Pacific's Sacramento shops.
After the rebuilds, these locomotives were used through World War II. The first to be retired from active service were numbers 4040 and 4045, both on October 21, 1946; the last to be retired was number 4032 on August 8, 1949. All of this class were scrapped soon after retirement.
References
- Diebert, Timothy S. and Strapac, Joseph A. (1987). Southern Pacific Company Steam Locomotive Conpendium. Shade Tree Books. ISBN 0-930742-12-5.