This battery-powered engine produces safe-to-touch steam from its chimney as it speeds down the tracks. Once you're out of water, you can easily refill the engine using the refill load that's being pulled behind the train. Lift out the black refill load from the cargo wagon and carefully fill it with water, inject the water into the engine via the filling chimney at the front and then you're ready to go again. 2 AAA batteries required.