Southern Pacific class AC-11

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Southern Pacific class AC-11
OP-15947.jpg
SP 4274 leading an excursion train out of Reno, Nevada, on December 1, 1957.
Type and origin
Power type Steam
Builder Baldwin Locomotive Works
Serial number 64677 – 64706
Build date November 1942 – April 1943
Specifications
Configuration 4-8-8-2
Gauge 4 ft 8 12 in (1,435 mm)
Driver diameter 63 in (1,600 mm)
Weight on drivers 531,700 lb (241.2 t)
Locomotive weight 657,900 lb (298.4 t)
Boiler pressure 250 psi (1.7 MPa)
Feedwater heater 6SA Worthington
Cylinder size 24 in × 32 in (610 mm × 810 mm) (bore × stroke)
Performance figures
Tractive effort 124,300 lbf (553 kN)
Career
Operator(s) Southern Pacific Railroad
Class AC-11
Number(s) 4245 – 4274
First run November 24, 1942
Retired 1954 – 1958
Disposition scrapped

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.

References[edit]

  • Diebert, Timothy S. and Strapac, Joseph A. (1987). Southern Pacific Company Steam Locomotive Conpendium. Shade Tree Books. ISBN 0-930742-12-5.