Southern Pacific class AC-8

Infobox Locomotive
name=Southern Pacific class AC-8
powertype=Steam
railroad=Southern Pacific Railroad
gauge=4 ft 8½ in (1435 mm)
railroadclass=AC-8
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=4177 – 4204
numinclass=28
builder=Baldwin Locomotive Works
serialnumber=62265 – 62292
builddate=July-October 1939
firstrundate=August 18 1939
retiredate=1955 – 1957
disposition=scrapped
whytetype=4-8-8-2

Southern Pacific Railroad's AC-8 class of cab forward steam locomotives was the fifth of SP's 4-8-8-2 classes. They were built by Baldwin Locomotive Works in 1939.

The AC-8s were the first to receive the larger redesigned cab windows as standard equipment that were retrofitted onto earlier AC class locomotives. The locomotives were only slightly larger than their AC-7 predecessors.

The first AC-8 entered service on August 18 1939, and the last on November 26 1939. Number 4173 was first to be retired from active service on September 2 1954, while 4172 was the last on January 9 1958. All of these locomotives were scrapped, beginning with 4155 on November 26 1954, and ending with 4172 on April 24 1959.

References

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