Southern Pacific class AC-3

Type and origin
Power type	Steam

Specifications
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm) standard gauge
Driver dia.	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) in dia × stroke

Performance figures
Tractive effort	90,940 lbf (404,500 N)

Career
Operators	Southern Pacific Railroad
Class	AC-3
Number in class	20
Numbers	4029 – 4048
Retired	1948 – 1949
Disposition	scrapped

Southern Pacific Railroad's AC-3 class of steam locomotive was the last cab forward design based on the 2-8-8-2 wheel arrangement. All 20 locomotives in this class were rebuilds from MC-6 class locomotives originally built by Baldwin Locomotive Works in 1912 and 1913. The rebuilds all took place in the late 1920s at Southern Pacific's Sacramento shops.

After the rebuilds, these locomotives were used through World War II. The first to be retired from active service were numbers 4040 and 4045, both on October 21, 1946; the last to be retired was number 4032 on August 8, 1949. All of this class were scrapped soon after retirement.

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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