Steam by the Numbers from Kalmbach answers many questions about steam locomotive evolution, explaining the reasons why so many wheel arrangements were developed. Author Brian Solomon helps you understand why a fast passenger locomotive was not well-suited to heavy freight service, or why a big articulated locomotive that performed well on heavy, slow coal trains in the mountains would not be a good choice for fast freight in the Midwest. This book explores over 30 wheel arrangements, uncovering the history, development, and operational significance of each arrangement, shedding light on why locomotives varied based on duty, geography, You′ll get into the history of each wheel arrangement, explaining why each was developed, when it appeared, how many were built, how they operated and the major railroads that used them. This book is perfect for railfans, as well as modelers who like to choose and operate models more realistically. Steam by the Numbers is one of many Kalmbach railroad books.