Classic Streamliners - TRAINCYCLOPEDIA
Southern Pacific Class MC-4 Mallet Consolidation Cab Forward Steam Locomotive
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 modified from compound to simple using uniform size cylinders, and feedwater heaters were also installed to help 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.
Southern Pacific Class MC-4 Overview
Type and origin
Power type: Steam
Builder: Baldwin Locomotive Works
Serial number: 36490-36493, 36524-36527, 36614-36616, 36634
Build date: April–May 1911
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver diameter: 57 in (1,448 mm)
Adhesive weight: 398,500 lb (180,800 kg)
Loco weight: 432,600 lb (196,200 kg)
Boiler pressure: 200 psi (1.4 MPa)
High-pressure cylinder: 26 in × 30 in (660 mm × 762 mm)
Low-pressure cylinder: 40 in × 30 in (1,016 mm × 762 mm)
Tractive effort: 85,040 lbf (378.28 kN)
(Click image for more information)
SP cab forward No. 4017.
Text: wikipedia.org. Images: Public Domain; http://www.commons.wikimedia.org (unless otherwise specified) and 17 U.S. Code § 107 fair use. References: Lewis, Robert G. The Handbook of American Railroads. New York: Simmons-Boardman Publishing Corporation, 1951, 2nd Edition 1956. Site Map Contact webmaster HERE.
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