Railroads & Locomotives Locomotives Locomotive profile: 4-8-8-4 Big Boy type steam locomotive

Locomotive profile: 4-8-8-4 Big Boy type steam locomotive

By Angela Cotey | February 20, 2020

| Last updated on November 3, 2020


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Union Pacific Big Boy type steam locomotive No. 4011 ross west at Granite, Wyoming, in 1956.
Union Pacific Big Boy type steam locomotive No. 4011 ross west at Granite, Wyoming, in 1956.
Jim Ehernberger
4-8-8-4

•YEARS BUILT: 1941 to 1944

•MANUFACTURER: Alco

•OPERATED ON: Union Pacific

•NAME: Big Boy

•QUANTITY: 25

•BOILER PRESSURE: 300 psi

•KNOWN FOR: Among the heaviest and most powerful reciprocating-piston steam locomotives ever built

•STATUS: Eight preserved: 4004 in Cheyenne, Wyo.; 4005 at Forney Museum in Denver; 4006 at Museum of Transport in St. Louis; 4012 at Steamtown in Scranton, Pa.; 4014 under restoration by Union Pacific; 4017 at National Railroad Museum in Green Bay, Wis.; 4018 at Museum of the American Railroad, Frisco, Texas; 4023 at Lauritzen Gardens, Omaha, Neb.

One thought on “Locomotive profile: 4-8-8-4 Big Boy type steam locomotive

  1. Actually, 4014 has since now been restored. Why is there no image of her on an excursion on this page?

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