Southern Pacific class AC-12
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| Power type | Steam |
|---|---|
| Builder | Baldwin Locomotive Works |
| Serial number | 70082 – 70101 |
| Build date | October 1943 – March 1944 |
| Configuration | 4-8-8-2 |
| Gauge | 4 ft 8½ in (1435 mm) |
| Driver size | 63 in diameter |
| Weight on drivers | 531,700 lb |
| Total weight | 657,900 lb |
| Boiler pressure | 250 psi |
| Feedwater heater | 6SA Worthington |
| Cylinder size | 24 in dia × 32 in stroke |
| Tractive effort | 124,300 lbf |
| Career | Southern Pacific Railroad |
| Class | AC-12 |
| Number in class | 20 |
| Number | 4275 – 4294 |
| First run | October 27, 1943 |
| Retired | 1955 – 1958 |
| Disposition | scrapped; one preserved |
Southern Pacific Railroad's AC-12 class of cab forward steam locomotives was the last class of steam locomotives ordered by Southern Pacific. They were built by Baldwin Locomotive Works during World War II, with the first, number 4275, entering service on October 27, 1943, and the last, 4294, on March 19, 1944.
SP used the AC-12s for a little over a decade with the first retirements occurring on April 5, 1955, and the last on September 24, 1958. All but one of this class, number 4294, was scrapped.
[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) |
