Southern Pacific class AC-10

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Southern Pacific class AC-10
Power type Steam
Builder Baldwin Locomotive Works
Serial number 64287 – 64326
Build date January-July 1942
Configuration 4-8-8-2
Gauge ft 8½ in (1435 mm)
Driver size 63 in diameter
Weight on drivers 531,700 lb
Locomotive weight 657,900 lb
Boiler pressure 250 psi
Feedwater heater 6SA Worthington
Cylinder size 24 in dia × 32 in stroke
Tractive effort 124,300 lbf
Career Southern Pacific Railroad
Class AC-10
Number in class 40
Number 4205 – 4244
First run February 17, 1942
Retired 1955 – 1958
Disposition 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.

[edit] References

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