| Southern Pacific class MC-4 |
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| Type and origin |
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| Power type | Steam |
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| Builder | Baldwin Locomotive Works |
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| Serial number | 36490-36493, 36524-36527, 36614-36616, 36634 |
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| Build date | April–May 1911 |
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| Specifications |
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Configuration:
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| • Whyte | 2-8-8-2 |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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| Driver dia. | 57 in (1,448 mm) |
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| Adhesive weight | 398,500 lb (180,800 kg) |
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| Loco weight | 432,600 lb (196,200 kg) |
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| Boiler pressure | 200 psi (1.4 MPa) |
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| High-pressure cylinder | 26 in × 30 in (660 mm × 762 mm) |
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| Low-pressure cylinder | 40 in × 30 in (1,016 mm × 762 mm) |
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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 sufficient 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.
References
- Diebert, Timothy S. & Strapac, Joseph A. (1987). Southern Pacific Company Steam Locomotive Conpendium. Shade Tree Books. ISBN 0-930742-12-5.