This Motorized Engine has strong magnets to pull your cars along. The rear wheels have rubber tread for traction. The small switch on the side of the engine turns power on and off. This is a must for your little engineer, and a great addition for any train set. This Engine is Compatible with Thomas the Train, Brio and other fine wooden train sets and accessories. Length and height dimensions sometimes vary between the different brands but that doesn't diminish their ability to interconnect and make for a great time! Powered by 1 aaa battery which is not included. For ages three and up.