Southern Pacific class AC-10

Type and origin
Power type	Steam
Builder	Baldwin Locomotive Works
Serial number	64287 – 64326
Build date	January–July 1942

Specifications
Configuration	4-8-8-2
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm) standard gauge
Driver dia.	63 in (1,600 mm)
Adhesive weight	531,700 lb (241,200 kg; 241.2 t)
Loco weight	657,900 lb (298,400 kg; 298.4 t)
Boiler pressure	250 psi (1.7 MPa)
Feedwater heater	6SA Worthington
Cylinder size	24 in × 32 in (610 mm × 813 mm) (bore × stroke)

Performance figures
Tractive effort	124,300 lbf (553 kN)

Career
Operators	Southern Pacific Railroad
Class	AC-10
Number in class	40
Numbers	4205 – 4244
First run	February 17, 1942
Retired	1955 – 1958
Disposition	all scrapped

Southern Pacific Railroad's AC-10 class was the largest class of cab forward steam locomotives produced for the railroad. The design of this and the previous AC classes proved so successful for SP that the railroad began placing orders for the AC-10's successors, AC-11s, while Baldwin Locomotive Works was still busy building and delivering the AC-10s. Mechanically, the AC-10s were exceptionally similar to their immediate predecessors, the AC-8s.

The first AC-10, number 4205, entered service on February 17, 1942, and the last, 4244, on August 19, 1942. SP used these locomotives for about fifteen years, with the first retirements of this class (three locomotives) occurring on April 5, 1955 and the last (three more of the class) on September 24, 1958. The locomotives were scrapped soon after they were retired, with the last one, number 4243, scrapped on August 7, 1959.

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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