Southern Pacific class AC-5

Type and origin
Power type	Steam
Builder	Baldwin Locomotive Works
Serial number	60866-60869, 60884-60889, 60952-60957
Build date	July–September 1929

Specifications
Configuration	4-8-8-2
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm) standard gauge
Driver dia.	63 in (1,600 mm)
Adhesive weight	482,500 lb (218,900 kg; 218.9 t)
Loco weight	622,600 lb (282,400 kg; 282.4 t)
Boiler pressure	235 psi (1.62 MPa)
Feedwater heater	4¼-BL Worthington
Cylinder size	24 in × 32 in (610 mm × 813 mm) (bore × stroke)

Performance figures
Tractive effort	116,900 lbf (520 kN)

Career
Operators	Southern Pacific Railroad
Class	AC-5
Number in class	16
Numbers	4110-4125
First run	August 16, 1929
Retired	1955
Disposition	All scrapped

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.

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.

References

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

Cab forward steam locomotives of Southern Pacific Railroad

2-6-6-2	MM-2

4-6-6-2	AM-2

2-8-8-2	MC-1 MC-2 AC-1 MC-4 AC-2 MC-6 AC-3

4-8-8-2	AC-4 AC-5 AC-6 AC-7 AC-8 AC-10 AC-11 AC-12

Preserved	SP 4294 (AC-12)

Southern Pacific Railroad Articulated Consolidation Steam Locomotives

2-8-8-2	AC-1 AC-2 AC-3

2-8-8-4	AC-9

4-8-8-2	AC-4 AC-5 AC-6 AC-7 AC-8 AC-10 AC-11 AC-12

Preserved	SP 4294 (AC-12)

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