Southern Pacific class AC-12

Southern Pacific class AC-12
Type and origin Power type Steam Builder Baldwin Locomotive Works Serial number 70082 – 70101 Build date October 1943 – March 1944
Specifications Configuration: ​  • Whyte 4-8-8-2 Gauge 4 ft 8½ in (1435 mm) Adhesive weight 531,700 lb Boiler pressure 250 psi Feedwater heater 6SA Worthington Cylinder size 24 in dia × 32 in stroke
Performance figures Tractive effort 124,300 lbf
Career Number in class 20 First run October 27 1943 Retired 1955 – 1958 Disposition scrapped; one preserved

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.

References

• Diebert, Timothy S. and Strapac, Joseph A. (1987). Southern Pacific Company Steam Locomotive Conpendium. Shade Tree Books. ISBN 0-930742-12-5.{{cite book}}: CS1 maint: multiple names: authors list (link)