This work investigates the evolution of North American transportation infrastructure through the lens of cartographic history during the industry's formative century. Andrew M. Modelski, a former specialist at the Library of Congress, utilizes the extensive collection of the Geography and Map Division to document how maps functioned not only as navigational tools but as promotional instruments for railroad expansion. The text provides a chronological framework that links the physical growth of rail networks to the shifting political and economic landscape of the continent.

Historians and cartographers frequently cite this volume as a primary reference for understanding the visual history of American expansion. Experts note the high quality of the reproductions and the scholarly rigor applied to the cataloging of these historical documents.