Choo choo TrainBots coming through All aboard Put on your engineer's cap and build your own steampunk-style train robot with amazing steam effects. You can build your TrainBot in two different configurations: a rolling train and a walking robot. Turn it on and watch it go, with cool water vapor ""steam"" billowing from its chimney, lit up in a fiery orange glow. Learn about how the ultrasonic atomizer works, about the differences between fog, smoke, and steam, and about the steampunk craze. The experiment manual includes step-by-step assembly instructions as well as a fun, comic-book-style story that brings the TrainBots to life.