| Big Boy 4015 leads a Denver ore train through Speer, Wyoming in October of 1957. Time is running out for the Big Boys. By December of 1958, half of the fleet will be stored. 4015 was the last Big Boy to pull a revenue train in July of 1959, and will be the first one scrapped in September of 1961. Obtained from Union Pacific Steam: Big Boy Portraits (Bush, Ehernberger) |