Southern Pacific class AC-4
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| Power type | Steam |
|---|---|
| Builder | Baldwin Locomotive Works |
| Serial number | 60575, 60576, 60623-60625, 60666-60669 |
| Build date | August-October 1928 |
| Configuration | 4-8-8-2 |
| Gauge | 4 ft 8½ in (1435 mm) |
| Driver size | 63 in diameter |
| Weight on drivers | 475,200 lb (215,500 kg) |
| Total weight | 614,600 lb (278,800 kg) |
| Boiler pressure | 235 psi (1.62 MPa) |
| Feedwater heater | 4¼-BL Worthington |
| Cylinder size | 24 in dia × 32 in stroke |
| Tractive effort | 112,760 lbf (501.6 kN), 116,900 lbf (520.0 kN) rebuilt |
| Career | Southern Pacific Railroad |
| Class | AC-4 |
| Number in class | 10 |
| Number | 4100 – 4109 |
| First run | October 1928 |
| Disposition | scrapped |
Southern Pacific Railroad's AC-4 class of steam locomotives was the first class of cab forward locomotives built with the 4-8-8-2 wheel arrangement. They were designed as an improvement upon the railroad's existing MC class 2-8-8-2 locomotives having a larger firebox.
The AC-4s were built in August through October 1928 by Baldwin Locomotive Works. As delivered, they produced 112,760 lbf of tractive effort; after a January 1931 rebuild, this class was capable of 116,900 lbf of tractive effort.
All ten of the AC-4s were removed from active service between 1953 and 1955 and scrapped by June 1955.
[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) |
