Southern Pacific Railroad The Southern Pacific (or Espee from the railroad initials- SP) was an American Class I railroad network that existed from 1865 to 1996 and operated largely in the Western United States. The system was operated by various companies under the ...

's AC-1 class of

cab forward The term cab forward refers to various rail and road vehicle designs that place the driver's compartment substantially farther towards the front than is common practice. Rail locomotives In steam locomotive design, a cab forward design will ...

steam locomotive A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the locomot ...

s consisted of locomotives rebuilt from MC-1 and MC-2 class locomotives that were originally built by

Baldwin Locomotive Works The Baldwin Locomotive Works (BLW) was an American manufacturer of railroad locomotives from 1825 to 1951. Originally located in Philadelphia, it moved to nearby Eddystone, Pennsylvania, in the early 20th century. The company was for decades t ...

in 1909.. The MC-2 class was the first class of locomotives built and delivered to SP as cab forward locomotives in late 1909. The AC-1 class was the first of the successful AC series of cab forward locomotives that numbered nearly 200 in total on the SP. Southern Pacific No. 4002 was rebuilt in June 1923 as a Cab Forward. Their rebuilds into class AC-1 was around June 1931. SP used the rebuilt locomotives through the traffic rush of World War II, then the SP removed them from the roster soon after the war. They were all retired from active service by 1949 and were scrapped soon after their retirement. The last locomotive of this class that was scrapped was number 4014 on April 12, 1949. None of the original AC-1's were preserved. The only cab forward left in the United States of America is SP No. 4294, an AC-12 built in March 1944.

References

* * ;Specific Baldwin locomotives Mallet locomotives AC-01 2-8-8-2 locomotives Simple articulated locomotives Steam locomotives of the United States Scrapped locomotives Standard gauge locomotives of the United States Cab forward steam locomotives Freight locomotives {{steam-loco-stub