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)