Fisher-Price Thomas & Friends TrackMaster, Motorized Thomas Engine Motorized TrackMaster Thomas engine Redesigned TrackMaster engines feature enhanced speed and performance The perfect addition to your expandable, connectable, motorized Fisher-Price Thomas & Friends TrackMaster, world Motorized train play is compatible with most TrackMaster track and playsets (sold separately) Requires 2 AAA batteries (Best with Polaroid AA Batteries)