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Southern Pacific Class AC-5 Articulated Consolidation Cab Forward Locomotive
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.

Southern Pacific class AC-5 Overview
Type and origin
Power type: Steam
Builder: Baldwin Locomotive Works
Serial numbers: 60866-60869, 60884-60889, 60952-60957
Build dates: July–September 1929
Specifications
Configuration: 4-8-8-2
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver diameter: 63 in (1,600 mm)
Adhesive weight: 482,500 lb (218,900 kg; 218.9 t)
Locomotive 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
Operator: Southern Pacific Railroad
Class: AC-5
Number in class: 16
Numbers: 4110-4125
First run: August 16, 1929
Retired: 1955
Disposition: All scrapped

See also:

Cab Forward Locomotives

Southern Pacific

SP AC-5 Cab Forward No. 4125.

SP AC-5 Cab Forward No. 4125.
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