Southern Pacific class AC-2
| Southern Pacific class AC-2 |
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| Type and origin |
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| Power type |
Steam |
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| Specifications |
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| Configuration |
2-8-8-2 |
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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 (199,900 kg) |
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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 (404,500 N) |
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| Career |
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| Operator(s) |
Southern Pacific Railroad |
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| Class |
AC-2 |
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| Number in class |
12 |
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| Number(s) |
4017 – 4028 |
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| Retired |
1947 1948 |
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| Disposition |
scrapped |
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Southern Pacific Railroad's AC-2 class of steam locomotives was the second in the AC series of cab forward locomotives built for Southern Pacific (SP). This class consisted of locomotives that were rebuilt from Baldwin-built SP MC-4 class locomotives by 1930.
The rebuild from MC-4 class gained the locomotives about 5,000 pounds-force (22 kN) in tractive effort, but also increased the locomotives' weight by about 50,000 pounds. The locomotives were deemed successful and remained in active service until after World War II.
References
- Diebert, Timothy S. and Strapac, Joseph A. (1987). Southern Pacific Company Steam Locomotive Conpendium. Shade Tree Books. ISBN 0-930742-12-5.