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Southern Pacific Class AC-11 Cab Forward Steam Locomotive
Southern Pacific Railroad's AC-11 class of cab forward steam locomotives was the seventh class of 4-8-8-2 locomotives ordered by Southern Pacific (SP) from Baldwin Locomotive Works; SP was so pleased with the AC-10 class built a year earlier that the railroad began placing orders for AC-11s while the AC-10s were still being built and delivered. They were built between November 1942 and April 1943, closely resembling the AC-10s.

The first AC-11, number 4245, entered service on November 24, 1942, and the last, 4274, on May 9, 1943. SP used these locomotives for between 12 and 15 years, with the last retirements from this class occurring on September 24, 1958. Shortly after their retirement, the AC-11s were scrapped, with the last, number 4262, on August 27, 1959.

Southern Pacific Class AC-11 Overview
Type and origin
Power type: Steam
Builder: Baldwin Locomotive Works
Serial numbers: 64677 – 64706
Build dates: November 1942 – April 1943
Specifications
Configuration: 4-8-8-2
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)
Performance figures
Tractive effort: 124,300 lbf (553 kN)
Career
Operator: Southern Pacific Railroad
Class: AC-11
Numbers: 4245 – 4274
First run: November 24, 1942
Retired: 1954 – 1958
Disposition: All scrapped

See also:

Cab Forward Locomotives

Southern Pacific

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Southern Pacific Class AC-11 Cab Forward Locomotive No. 4246

Southern Pacific Class AC-11 Cab Forward Locomotive No. 4246

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