Southern Pacific class AC-10

Infobox Locomotive
name=Southern Pacific class AC-10
powertype=Steam
railroad=Southern Pacific Railroad
gauge=4 ft 8½ in (1435 mm)
railroadclass=AC-10
driversize=63 in diameter
cylindersize=24 in dia × 32 in stroke
weight=657,900 lb
weightondrivers=531,700 lb
boilerpressure=250 psi
tractiveeffort=124,300 lbf
feedwaterheater=6SA Worthington
roadnumber=4205 – 4244
builder=Baldwin Locomotive Works
serialnumber=64287 – 64326
builddate=January-July 1942
firstrundate=February 17 1942
retiredate=1955 – 1958
disposition=scrapped
numinclass=40
whytetype=4-8-8-2

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

*