Union Pacific said Wednesday steam shop crews lit a fire in Big Boy 4-8-8-4 No. 4014 for the first time in 60 years on April 9. It was the first time the engine was fired up as an oil burner.
The steam locomotives will remain on display at Ogden Union Station until May 12, when they return home to the Steam Shop in Cheyenne, Wyoming.
No Big Boy locomotive has run under its own power since 1959, and its restoration is unprecedented in the annals of American steam locomotive preservation.