|Rare and out of print 1995 softbound edition, written by Paul Ambrose. One of the best books out on Lionel covering the numerous varitions that have been overlooked. During their sometimes lengthy production runs during the postwar era, many trains underwent changes to reduce cost, maximize part interchaneability, or simplify the assembly process. Lionel collectors commonly refer to these changes as "variations". This book studies the variations and how they were made. Includes detailed information on motive power, passenger cars, and rolling stock. Alot great information on diesel engines. Includes over 200 color photographs.