Learn about trains that go underground, across water, through rock and more. Packed with detailed photography, the latest bite-size facts and a bonus audio download, this book has everything a things-that-go fan could need. It's all about... is a collectable series, including Cool Cars, Dangerous Dinosaurs and Wild Weather, filled with up-to-date stats and facts about a wide range of hot topics, including animals, history, technology, and vehicles. Each book comes with a bonus audio download so children can take their book wherever they go, as well as a glossary that's perfect for teaching and learning. Check out the other titles in the It's all about... series and see if you can collect them all!