History: During the late 1930s, the Union Pacific often used helpers to move trains from Ogden to Wahsatch. The Union Pacific wanted to simplify this move so they asked their “Department of Research and Mechanical Standards” to design a locomotive that could pull a 3600 ton train unassisted over the 1.14% grade of the Wahsatch.
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.
Some LEGO Freaks (Jason Steinhurst, Duke) build Replicas out of Bricks.
Please visit the post from Duke. He built a replica of Jayhurst’s model because he think is the best Lego conversion of this iconic steam engine.
Please visit the flickr site of Jason Steinhurst
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