Southern Pacific class AC-1

Southern Pacific Railroad's AC-1 class of cab forward steam locomotives consisted of locomotives rebuilt from MC-1 and MC-2 class locomotives that were originally built by Baldwin Locomotive Works in 1909.[1] The MC-2 class was the first class of locomotives built and delivered to SP as cab forward locomotives in late 1909.[1] 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.

Southern Pacific class AC-1
Southern Pacific No. 4002
Type and origin
Power typeSteam
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Driver dia.57 in (1,448 mm)
Adhesive weight440,800 lb (199,900 kg)
Loco weight481,200 lb (218,300 kg)
Boiler pressure210 psi (1,400 kPa)
Feedwater heater4¼-BL Worthington
Cylinder size22 in × 30 in (559 mm × 762 mm) dia × stroke
Performance figures
Tractive effort90,940 lbf (404.5 kN)
OperatorsSouthern Pacific Railroad
Number in class15
Numbers4000 4010, 4012, 4014 4016
Retired1947 1948
DispositionAll scrapped

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. Sadly, 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.


  • Diebert, Timothy S. & Strapac, Joseph A. (1987). Southern Pacific Company Steam Locomotive Conpendium. Shade Tree Books. ISBN 0-930742-12-5.
  • Yenne, Bill (1996). The History of the Southern Pacific. New York, New York: Smithmark Pub. ISBN 978-0831737887.
  1. Yenne (1996), p. 96.

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