Tripp loves the book Freight Train by Donald Crews. The book is very simple, following a freight train on its path through the mountains. Each train car is a different color and the illustrations are bright and bold.
Through the blog Mama's Happy Hive, I found this PDF which had very similar train cars to the cars in the book. We have a home laminator so I printed them out, cut each train and then we laminated them. Now Tripp can set up his own freight train however he likes, or follow the train from the book.
