This standard work covers the history of toy trains from 1840 to 1955 and is copiously illustrated. The price guide included with the book is of course dated, but the content is not.
Toy Trains, A History

Specifications
Dimension: 21.5 x 25.5 cm
Remarks: 160 pages
Author: Pierce Carlson
ISBN: 0-06-015614-7
Published: January 1986
Format: Hardcover