This book contains exterior and interior photos, many taken from the railway's own public relations photo collection, as well as floor plan drawings offering new insight into this important element in the AT&SF passenger operations in the steamlined lightweight era. Modelers will also find the material presented of interest and value in their projects. Although representing only a small part of the Santa Fe's huge passenger fleet, the subject is of great interest since the observation cars not only provided lounge space, but carried the tail-sign of named trains, and in themselves often represented the train's status and class.