Southern Pacific class AC-5

Southern Pacific Railroad's AC-5 class of steam locomotives was the railroad's second class of 4-8-8-2 cab forward locomotives. They were built between July and September 1929 and placed in service soon after construction. The AC-5 class was only slightly larger than the AC-4 class.

Southern Pacific class AC-5
Type and origin
Power typeSteam
BuilderBaldwin Locomotive Works
Serial number60866-60869, 60884-60889, 60952-60957
Build dateJuly–September 1929
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Driver dia.63 in (1,600 mm)
Adhesive weight482,500 lb (218,900 kg; 218.9 t)
Loco weight622,600 lb (282,400 kg; 282.4 t)
Boiler pressure235 psi (1.62 MPa)
Feedwater heater4¼-BL Worthington
Cylinder size24 in × 32 in (610 mm × 813 mm) (bore × stroke)
Performance figures
Tractive effort116,900 lbf (520 kN)
OperatorsSouthern Pacific Railroad
Number in class16
First runAugust 16, 1929
DispositionAll scrapped

The first locomotive of this class, number 4110, holds the dubious honor of being the first 4-8-8-2 cab forward locomotive to be scrapped when it befell this fate on February 3, 1953, at the railroad's Sacramento, California, shops. The rest of the class were removed from service and scrapped by mid-1955. None of this class was preserved.


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