Union Pacific Motive Power in Transition: 1936-1960

Fascinating look at the Union Pacific's transition from steam to diesel power. The author provides a behind the scenes discussion of why UP built its "super steam" locomotives and later switched to diesels and turbines. With charts showing the number of steam locomotives and their locations in 1942, 1947, 1955 and 1957. Illustrated throughout with black and white photos. With 2 maps. 64 pages.