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The Union Pacific Big Boys will be built by the Builder now producing the Southern Pacific Cab Forwards.  Please watch for updates on this project.

Chick here to watch 4014's move from CA to WY & the rest of UP's Steam

Click Here to watch 4014's Progress


Big Boy is the popular name of the American Locomotive Company 4000-class 4-8-8-4 articulatedcoal-fired, steam locomotives manufactured between 1941 and 1944 and operated by the Union Pacific Railroad until 1959. The Big Boy fleet totaled twenty five locomotives that were used primarily in the Wyoming Division to haul freight between Green River, Wyoming and Ogden, Utah. The Big Boy locomotives were the only locomotives to use a 4-8-8-4 wheel arrangement, consisting of a four-wheel leading truck for stability entering curves, two sets of eight driving wheels and a four-wheel trailing truck to support the large firebox
.According to Ed Dickens Jr., Union Pacific's senior manager of heritage operations, the legendary name was coined by an unknown worker who scrawled "Big Boy" in  

chalk on the front of one of the engines as it was being built.  It became the nickname thereafter.

The 25 Big Boys were built in two groups. The first group, called "class 1", were built starting in 1941. They were numbered 4000-4019. The second group, "class 2", were built in 1944. They were numbered 4020-4024. The last revenue freight pulled by a Big Boy was in July of 1959. Most were retired in 1961. The last one was retired in July of 1962. As late as September, 1962, there were still four operational Big Boys at Green River, WY.


Click on below Big Boy Photo to go to Dr. Richard Leonard's Rail Archive Website with hundreds or Beautiful Railroad Photos.
All Photos are copywrited and used with Dr. Leonard's permission

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4024 at Laramie, WY, August 1957 Photo by David V. Leonard

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4023 at Laramie, WY, August 15, 1957 - Richard Leonard Photo

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4011 at Laramie, WY, August 16, 1957 - Richard Leonard Photo
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4010 at Laramie, WY, August 16, 1957 - David V. Leonard Photo
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4008 at Laramie WY, August 1957 - David V. Leonard Photo
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4008 at Laramie WY, August 1957 - David V. Leonard Photo
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4007 on the hill east of Laramie WY, August 17, 1957
up4005-33.jpg
4005 at Laramie WY, August 16, 1957
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4002 at Laramie WY, August 17, 1957
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4002 at Laramie WY, August 17, 1957

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