Southern Pacific class AC-2

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Southern Pacific class AC-2

Power type	Steam
Configuration	2-8-8-2
Gauge	4 ft 8½ in (1435 mm)
Driver size	57 in diameter
Weight on drivers	440,800 lb (199,900 kg)
Locomotive weight	481,200 lb
Boiler pressure	210 psi
Feedwater heater	4¼-BL Worthington
Cylinder size	22 in dia × 30 in stroke
Tractive effort	90,940 lbf (404,500 N)
Career	Southern Pacific Railroad
Class	AC-2
Number in class	12
Number	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. The locomotives were deemed successful and remained in active service until after World War II.

[edit] References

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

v • d • e Cab forward steam locomotives of Southern Pacific Railroad 2-6-6-2 MM-2 (rebuilt as 4-6-6-2) 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)