Each full-color, hardcover book contains hundreds of images - perfect for enthusiasts who want to see how things were, or for modelers who need a color reference. Most volumes are 128 pages long. Noted steam expert Bert Pennypacker takes the reader onb a class-by-class tour of the Pennsylvania Railroads steam roster. Covers everything from switchers to local power to the finest mainline freight and passenger service. Hardcover, 128 pages, full-color.