The Union Pacific Big Boy is a type of simple articulated 4-8-8-4 steam locomotive manufactured by the American Locomotive Company (ALCO) between 1941 and 1944 and operated by the …

Union Pacific No. 4019 was a four-cylinder articulated 4-8-8-4 steam locomotive owned by Union Pacific railroad it was built 1941 by Alco to solve a tractive power deficit with the 4-6-6-4 …

Steaming it up under the coaling tower at Laramie is 4-8-8-4 4019. Having been built by ALCo in December 1941, 4019 was retired in January 1962.

The UP Class 4000, 4-8-8-4 articulated BigBoy was the answer. Alco Locomotive Works was commissioned to build the engine. Starting in 1941, 20 engines were built: #4000 to #4019, …

The UP wanted to simplify this move so they asked their "Department of Research and Mechanical Standards" (DoRMS) to design a locomotive that could pull a 3600 ton train …

Feb 25, 2025 · Few steam locomotives compare to Union Pacific's (UP) colossus 4-8-8-4 "Big Boy." It was designed during the zenith of seam technology and earned celebrity status as …

Publishers or production companies who wish to use Union Pacific images should contact the museum at (402) 501-3841 for additional assistance. Information also is available on our …

Road Number 4019 with 25-C-1 tender, notice the smoke lifters, the only Big Boy so equipped

"The largest and most magnificent steam locomotives ever built! They were built to pull large tonnage over the 1.55% continuous grade up Sherman Hill between Cheyenne and Laramie …

Apr 10, 2025 · UP 4019 was equipped with smoke lifters, which UP called "Wind Wings." Gordon McCulloh wrote: "Late in 1945, 4019 was fitted with a pair of smoke lifting Wind Wings. These …