Choo choo! TrainBots coming through! All aboard! Put on your engineers 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. This retro-futuristic model is packed with modern technology, including an electric motor, LED lights, circuit board, and an innovative ultrasonic atomizer that transforms tap water into the fine mist that rises from the chimney. 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.