Big Boy No. 4014

Union Pacific

AP

A worker walks past the wheels on the Big Boy No. 4014 at 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. (AP Photo/P. Solomon Banda)

Union Pacific

Big Boy No. 4014

Union Pacific

Big Boy No. 4014

AP

The 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. (AP Photo/P. Solomon Banda)

Union Pacific

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Big Boy No. 4014

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