Southern Pacific class AC-2
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| Power type | Steam |
|---|---|
| Configuration | 2-8-8-2 |
| Gauge | 4 ft 8½ in (1435 mm) |
| Driver size | 57 in diameter |
| Weight on drivers | 440,800 lb |
| Total weight | 481,200 lb |
| Boiler pressure | 210 psi |
| Feedwater heater | 4¼-BL Worthington |
| Cylinder size | 22 in dia × 30 in stroke |
| Tractive effort | 90,940 lbf |
| Career | Southern Pacific Railroad |
| Class | AC-2 |
| Number in class | 12 |
| Number | 4017 – 4028 |
| Retired | 1947 1948 |
| Disposition | scrapped |
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 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.
[edit] References
- Diebert, Timothy S. and Strapac, Joseph A. (1987). Southern Pacific Company Steam Locomotive Conpendium. Shade Tree Books. ISBN 0-930742-12-5.
| Cab forward steam locomotives of Southern Pacific Railroad | |
|---|---|
| 2-6-6-2: | MM-2 (rebuilt as 4-6-6-2) |
| 2-8-8-2: | MC-1 · MC-2 · AC-1 · MC-4 · AC-2 · MC-6 · AC-3 |
| 4-8-8-2: | AC-4 · AC-5 · AC-6 · AC-7 · AC-8 · AC-10 · AC-11 · AC-12 |
| Preserved: | SP 4294 (AC-12) |
