Classic Streamliners - TRAINCYCLOPEDIA
Southern Pacific Class MC-2 Mallet Consolidation Cab Forward Steam Locomotive
In order to supply fuel oil from the tender to the opposite end of the locomotive where the firebox sat, oil in the tender was pressurized. Five pounds-force per square inch (34 kPa) of air pressure was sufficient to move the oil to the fire.
The two MC-1 locomotives built in May 1909 were rebuilt in 1923 as MC-2 class with uniform cylinders measuring 22 in (559 mm) diameter × 30 in (762 mm) stroke; these rebuilt locomotives weighed 437,000 lb (198,000 kg), like the as-built MC-2 class, but with 393,700 lb (178,600 kg) on the drivers. Most of the MC-2 class were modified from compound to simple with the same size cylinders by 1931. Except for numbers 4011 and 4013 (which were both scrapped by 1936), all of the MC-2 and the two former MC-1 locomotives were rebuilt again into class AC-1 with a higher boiler pressure, but lower overall tractive effort. The MC-2 rebuilds included installation of a new 4¼-BL Worthington feedwater heater as well.
SP used these locomotives until after World War II, retiring and then scrapping them in 1947 and 1948. The last locomotive of this class was scrapped on April 12, 1949, at SP's Sacramento shops.
Southern Pacific class MC-2 Overview
An MC-2 Slideshow.
(Click on image for more information)
Southern Pacific class MC-2 Number 4014 in 1910.
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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.