This book investigates the evolution and cultural significance of the railroad passenger car in America. August Mencken, drawing on extensive historical research, details the technological advancements, design changes, and the social impact of these vehicles. The work examines how the passenger car shaped travel experiences, class distinctions, and the very fabric of American society during its heyday.

This work is recognized as a comprehensive and authoritative study on the history of the railroad passenger car. Scholars and enthusiasts alike have noted its meticulous research and detailed exploration of the subject. The book is valued for its ability to connect the technical evolution of the cars with their broader social and cultural implications, offering a rich understanding of their place in American history.