| Union Pacific 4007 is parked on a side track at Granite Canyon, Wyoming in June 1947. Test equipment and piping was mounted on the drivers side of the boiler while the engine simmers in the sun. 4007 was the 8th of UPs 25 Big Boys built, having been contructed by ALCO in September, 1941. This engine would serve with UP for around 18 years, finally being retired in 1959 along with the rest of UPs Big Boy fleet. 4007 would be cut up two years later, on October 31, 1961. Obtained from Union Pacific Steam: Big Boy Portraits (Bush, Ehernberger) |