This is the story of laying a railroad track. You see the rig used, you learn about all it's parts, then you lift the page and it gives you the name of the rig.
Abram's Appleseed sent me a copy of this book to review (thank you). It has been published, so you can get a copy now.
This would be a nice choice for boys who always love big rigs. They learn about the parts and they see what the rig can do. It's no little job to create a track for the railroad!