Southern Pacific class AC-2

Type and origin
Power type	Steam

Specifications
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)
Loco 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) dia × stroke

Performance figures
Tractive effort	90,940 lbf (404.5 kN)

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

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.

References

Diebert, Timothy S. and 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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