Southern Pacific class AC-3

Infobox Locomotive
name=Southern Pacific class AC-3
powertype=Steam
railroad=Southern Pacific Railroad
railroadclass=AC-3
gauge=4 ft 8½ in (1435 mm)
driversize=57 in diameter
cylindersize=22 in dia × 30 in stroke
weight=481,200 lb
weightondrivers=440,800 lb
boilerpressure=210 psi
tractiveeffort=90,940 lbf
feedwaterheater=4¼-BL Worthington
roadnumber=4029 – 4048
numinclass=20
retiredate=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.

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