Southern Pacific class AC-12

Infobox Locomotive
name=Southern Pacific class AC-12
powertype=Steam
railroad=Southern Pacific Railroad
gauge=4 ft 8½ in (1435 mm)
railroadclass=AC-12
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=4275 – 4294
numinclass=20
builder=Baldwin Locomotive Works
serialnumber=70082 – 70101
builddate=October 1943 – March 1944
firstrundate=October 27 1943
retiredate=1955 – 1958
disposition=scrapped; one preserved
whytetype=4-8-8-2

Southern Pacific Railroad's AC-12 class of cab forward steam locomotives was the last class of steam locomotives ordered by Southern Pacific. They were built by Baldwin Locomotive Works during World War II, with the first, number 4275, entering service on October 27 1943, and the last, 4294, on March 19 1944.

SP used the AC-12s for a little over a decade with the first retirements occurring on April 5 1955, and the last on September 24 1958. All but one of this class, number 4294, was scrapped.

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