Philadelphia-based Baldwin began designing and building steam locomotives in the 1830s and gave the U.S. many of its most significant and famous types of steam, and diesel-electric motive power. This history of Baldwin is illustrated with a large selection of rare, superb builder's photos and other publicity images from the Railroad Museum of Pennsylvania, with the book's large page size showcasing the detail and crisp quality of the images in this outstanding collection. Author Brian Solomon provides technical histories of each locomotive along with builder's specifications and explanations of how the locomotives were used by the railroads that bought them. These carefully researched histories are keys to understanding the significance of the locomotives and how they worked, and are presented in a manner that makes the book accessible to everyone, while retaining sufficient technical detail to appeal to the most ardent railroad enthusiast.