SOUTHERN PACIFIC CLASS MC-4

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.

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References

References

★ Southern Pacific Company Steam Locomotive Conpendium, Diebert, Timothy S. and Strapac, Joseph A., , , Shade Tree Books, 1987, ISBN 0-930742-12-5