This is so cool. I never knew about 80% of this. Young readers will know some of the big rigs (like an excavator, bucket truck), but there are plenty they won't (tunnel borer, tie dragon, among others). The author expertly layers individual pieces of equipment and the specialties of the people who use them AND tells a story about building a light rail. So much to "dig" in this book. The call-and-response format is perfect for this audience, as are the big lift-the-flap pages.