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Southern Pacific Class AC-2 Cab Forward Locomotive
Southern Pacific Railroad's AC-2 class of steam locomotives was the second in the AC series of cab forward locomotives built for Southern Pacific (SP). This class consisted of locomotives that were rebuilt from Baldwin-built SP MC-4 class locomotives by 1930.

The rebuild from MC-4 class gained the locomotives about 5,000 pounds-force (22 kN) in tractive effort, but also increased the locomotives' weight by about 50,000 pounds (23,000 kg). The locomotives were deemed successful and remained in active service until after World War II.

Southern Pacific class AC-2 Overview
Type and origin
Power type: Steam
Configuration: 2-8-8-2
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver diameter: 57 in (1,448 mm)
Adhesive weight: 440,800 lb (199,900 kg)
Locomotive weight: 481,200 lb (218,300 kg)
Boiler pressure: 210 psi (1,400 kPa)
Feedwater heater: 4¼-BL Worthington
Cylinder size: 22 in × 30 in (559 mm × 762 mm) diameter × stroke
Performance figures
Tractive effort: 90,940 lbf (404.5 kN)

Operator: Southern Pacific Railroad
Class: AC-2
Number in class 12
Numbers: 4017 – 4028
Retired: 1947 - 1948
Disposition: scrapped

See also:

Cab Forward Locomotives

Southern Pacific

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SP AC-2 Cab Forward locomotive No. 4025.
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SP AC-2 Cab Forward locomotive No. 4025.

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