This book is primarily a photo album of Baltimore & Ohio's steam locomotive fleet from the 1920s through to the end of steam, and includes excellent photos from Leonard Rice and Bruce Fales, as well as others. The photos are divided between exiting action scenes and portraits, making the book appealing to B&O fans of all types and to modelers. Many B&O official mechanical diagrams are reproduced from a 1954 Diagram book, showing the fleet at the very end of its life. The book is intended as a general overview of B&O power in the second quarter of the 20th Century, when it reached its apogee and then declined, supplanted by diesels. Many of the photos have not been published before.