Union Pacific Prototype Locomotive Photos Volume 36: 4-6-6-4 Challenger
This series of books covers all classes of steam locomotives of the UPRR and its subsidiaries. Each book is 80 pages in 11 x 8.5 horizontal format, printed on 100 lb. Union Pacific HS, softcover, 80 pages, 11 x 8.5 x. 25 in., B&W photographs with captions.