The first train reached a top speed of only 5 miles per hour, while some submarines can stay underwater for months at a time. We've come a long way from walking everywhere on foot, and this book for readers 4 to 8—illustrated with colorful images of vehicles on the go—may fill readers 4 to 8 with wonder as they learn about the ever-evolving world of bikes, cars, trains, buses, planes, and subways.