Classic Streamliners - TRAINCYCLOPEDIA
SP Class AC-8 Cab Forward No. 4203.
(Click image for more information)
Southern Pacific Class AC-8 Articulated Consolidation Cab Forward Steam Locomotive
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.
On November 19, 1941, No. 4193 caught on fire. It was carrying a freight train passing through Santa Susana Pass near Los Angeles. The train caught on fire because of a failure to shut off the oil feed. It was carrying 96 cars (not including its tender) and a caboose. A knuckle on the front end of the seventy-fifth car was broken when the accident occurred. Read more on the cab forward section. On May 3, 1941, No. 4199 suffered a boiler explosion at Cooper, California.
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.
Southern Pacific Class AC-8 Overview
Type and origin
Power type: Steam
Builder: Baldwin Locomotive Works
Serial numbers: 62265 – 62292
Build dates: July–October 1939
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver diameter: 63 in (1,600 mm)
Adhesive weight: 531,700 lb (241,200 kg; 241.2 t)
Locomotive weight: 657,900 lb (298,400 kg; 298.4 t)
Boiler pressure: 250 psi (1.7 MPa)
Feedwater heater: 6SA Worthington
Cylinder size: 24 in × 32 in (610 mm × 813 mm) (bore × stroke)
Tractive effort: 124,300 lbf (553 kN)
Operator: Southern Pacific Railroad
Number in class: 28
Numbers: 4177 – 4204
First run: August 18, 1939
Retired: 1955 – 1957
Text: wikipedia.org. Images: Public Domain; http://www.commons.wikimedia.org (unless otherwise specified) and 17 U.S. Code § 107 fair use. References: Lewis, Robert G. The Handbook of American Railroads. New York: Simmons-Boardman Publishing Corporation, 1951, 2nd Edition 1956. Site Map Contact webmaster HERE.
Purchases through our Merchant Links and Store help to defray the costs of operating the non-profit Classic Streamliners website, and at no additional cost to you. All of the staff at Classic Streamliners are unpaid volunteers who have all devoted thousands of hours of their own time to bring the site into fruition. We would like to sincerely thank all those who have already helped support this worthy cause. For more information click HERE.