Southern Pacific class MC-4
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| Power type | Steam |
|---|---|
| Builder | Baldwin Locomotive Works |
| Serial number | 36490-36493, 36524-36527, 36614-36616, 36634 |
| Build date | April-May 1911 |
| Configuration | 2-8-8-2 |
| Gauge | 4 ft 8½ in (1435 mm) |
| Driver size | 57 in diameter |
| Weight on drivers | 398,500 lb |
| Total weight | 432,600 lb |
| Boiler pressure | 200 psi |
| High-pressure cylinder size |
26 in dia × 30 in stroke |
| Low-pressure cylinder size |
40 in dia × 30 in stroke |
| Tractive effort | 85,040 lbf |
| Career | Southern Pacific Railroad |
| Class | MC-4 |
| Number | 4017 – 4028 |
| First run | July 21, 1911 |
| Retired | 1947 – 1948 |
| Disposition | scrapped |
Southern Pacific Railroad's MC-4 class of steam locomotive was the second class ordered and built as cab forward locomotives. Southern Pacific (SP) found the MC-2 class as sufficient enough for a proof-of-concept for cab forward locomotives and sought to continue with now tested designs.
In service, SP found that the locomotives were a little too slow for the traffic needs. By 1930, all of the MC-4 class had been "simpled" to use uniform size cylinders and feedwater heaters were installed to address the issue. They were then reclassified as AC-2 locomotives. As rebuilt, the locomotives continued in service through the end of 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) |
