Look Inside Cross-Sections: 7 Train by Dorling Kindersley Publishing
The "Look Inside Cross-Sections" series provide detail of complex machines, giving children X-ray vision. Each book contains artworks that cut across, up, down, and through objects, allowing every hidden part to be examined. Look inside the Beyer-Garratt locomotive (Australia, 1930's) or the Flying Hamburger (Germany, 1930's) in this book which examines trains.