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Union Pacific 3985 is a 4-6-6-4 steam locomotive built in 1943 by the American Locomotive Company.

Union Pacific 3985 is a steam locomotive built in 1943 by the American Locomotive Company.

Union Pacific #4017 in Green River, WY. ca. 1957 (Courtesy of R.H.Kindig).

Union Pacific Big Boy 4017 and a westbound mixed manifest round a curve on the approach to Green River, WY.

Union Pacific steam engine visiting WaKeeney, KS, in celebration of the 150th anniversary of the Pacific Railroad Act.

cz Union Pacific steam engine visiting WaKeeney, KS, in celebration of the anniversary of the Pacific Railroad Act.

Union Pacific Alco class 1 Big Boy 4-8+8-4 articulated steam locomotive # 4004, is seen on display along U.S. # 30 at Holiday Park, Wyoming, December 1974

Union Pacific ALCO class 1 Big Boy articulated steam locomotive # is seen on display along U. # 30 at Holiday Park, Wyoming, December 1974

Union Pacific "Big Boy"

Net Photo: UP 4014 Union Pacific Steam Big Boy at Pomona, California by David Carballido-Jeans

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