Southern Pacific class AC-8

Southern Pacific class AC-8
Type and origin Power type Steam Builder Baldwin Locomotive Works Serial number 62265 – 62292 Build date July-October 1939
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 28 First run August 18 1939 Retired 1955 – 1957 Disposition scrapped

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

• 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)