| Union Pacific 4009 trundles past a string of boxcars in the Cheyenne yard. The 4000-class behemoth was built in September 1941, and was equipped with all the lastest in steam technology. These units were equiped with a pressure lubrication system for the tender, 68" drivers, and roller bearings on all the axles. Despite this modernity, the 4000s were not immune from the march of progress. As diesels became ever more prominent on the Wyoming Division, the 4000s found their usefullness on the decline. By 1959, the final Big Boys were retired, and many, such as 4009, would be cut up for scrap. 4009 would meet the torch in May, 1963, after 18 years of service on the UP. Obtained from Union Pacific Steam: Big Boy Portraits (Bush, Ehernberger) |