Big Boy - Back in Steam covers the 1941-1959 history, 2014-2019 restoration, and May 2019 inaugural runs of Union Pacific Big Boy 4-8-8-4 No. 4014 on its original operating territory between Cheyenne, Wyo., and Ogden, Utah, across famous Sherman Hill and Wasatch Grade. Go with us day-by-day as Big Boy travels under its own 7,000-hp on its home turf in Wyoming and Utah for the first time in 60 years! A foldout cutaway drawing of Big Boy, a list of other surviving Big Boys, and a look at how they fit into the world of articulated locomotives rounds out this special edition.