Southern Pacific class AC-6

Infobox Locomotive
name=Southern Pacific class AC-6
powertype=Steam
railroad=Southern Pacific Railroad
gauge=4 ft 8½ in (1435 mm)
railroadclass=AC-6
whytetype=4-8-8-2
driversize=63 in diameter
cylindersize=24 in dia × 34 in stroke
weight=639,500 lb
weightondrivers=517,000 lb
boilerpressure=250 psi
tractiveeffort=124,300 lbf
feedwaterheater=6S Worthington
roadnumber=4126 – 4150
numinclass=25
builder=Baldwin Locomotive Works
serialnumber=61353, 61354, 61382-61389, 61416, 61426-61429, 61491-61494, 61535-61538, 61543, 61544
builddate=May-December 1930
firstrundate=July 10 1930
retiredate=1953 – 1955
disposition=scrapped

Southern Pacific Railroad's AC-6 class of steam locomotives was the third of the railroad's classes built with a 4-8-8-2 wheel arrangement. Like the earlier AC-4 and AC-5 classes, the AC-6 class were cab forward locomotives. The AC-6 was slightly larger than the previous classes with a higher boiler pressure and tractive effort rating.

In 1947 and 1948 this class was rebuilt with cast steel frames, increasing the overall weight to 648,000 lb (with 523,600 lb on the drivers). At this time most of the locomotives in the class were also equipped with larger cab windows that became standard for SP's cab forward locomotives beginning with the AC-8 class.

This class was removed from active service between 1954 and 1955 and they were all scraped by March 1956.

References

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