Southern Pacific class AC-1
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| Power type | Steam |
|---|---|
| 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-1 |
| Number in class | 15 |
| Number | 4000 – 4010, 4012, 4014 – 4016 |
| Retired | 1947 – 1948 |
| Disposition | scrapped |
Southern Pacific Railroad's AC-1 class of cab forward steam locomotives consisted of locomotives rebuilt from MC-1 and MC-2 class locomotives that were originally built by Baldwin Locomotive Works in 1909. The MC-2 class was the first class of locomotives built and delivered to SP as cab forward locomotives. The AC-1 class was the first of the successful AC series of cab forward locomotives that numbered nearly 200 in total on the SP.
Their rebuilds into class AC-1 occurred around 1930; SP used the rebuilt locomotives through the traffic rush of World War II, then removed them from the roster soon after the war. They were all retired from active service by 1949 and were scrapped soon after their retirement. The last locomotive of this class that was scrapped was number 4014 on April 12, 1949.
[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) |
