Southern Pacific class AC-11
SP 4274 leading an excursion train out of Reno, Nevada, on December 1, 1957.
Type and origin
Power typeSteam
BuilderBaldwin Locomotive Works
Serial number64677 – 64706
Build dateNovember 1942 – April 1943
Specifications
Configuration:
​
 • Whyte4-8-8-2
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.63 in (1,600 mm)
Adhesive weight531,700 lb (241,200 kg; 241.2 t)
Loco weight657,900 lb (298,400 kg; 298.4 t)
Boiler pressure250 psi (1.7 MPa)
Feedwater heater6SA Worthington
Cylinder size24 in × 32 in (610 mm × 813 mm) (bore × stroke)
Performance figures
Tractive effort124,300 lbf (553 kN)
Career
OperatorsSouthern Pacific Railroad
ClassAC-11
Numbers4245 – 4274
First runNovember 24, 1942
Retired1954 – 1958
Dispositionall 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;[1] 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 4274, in April of 1959.[2][3][4]

References

Further reading

  • Scribbins, Jim (1997). RailNews - Issues 398-403. Pentrex.
  • Boyd, James (1992). Railfan & Railroad - Volume 11. Carstens Publications.
  • Yenne, Bill (1994). Southern Pacific. SMITHMARK Publishers. ISBN 0831737883.
  • Ransome-Wallis, P. (2013). Illustrated Encyclopedia of World Railway Locomotives. Dover Publications. ISBN 9780486142760.
  • Diebert, Timothy S. & Strapac, Joseph A. (1987). Southern Pacific Company Steam Locomotive Conpendium. Shade Tree Books. ISBN 0-930742-12-5.
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