(AP Photo | P. Solomon Banda) Big Boy No. 4014 rolls out of a Union Pacific restoration shop at the Cheyenne Depot Museum in Cheyenne, Wyo., Saturday, May 4, 2019. One of the world's biggest and most powerful steam locomotives is chugging to its big debut after five years of restoration work. From there, it goes to Ogden, Utah, to help celebrate the 150th anniversary of the transcontinental railroad.