Fisher-Price Thomas & Friends TrackMaster, Motorized Hiro Engine Motorized TrackMaster engine collection Redesigned TrackMaster engines feature enhanced speed and performance Each engine is a great addition to your expandable, connectable, motorized Thomas & Friends TrackMaster world Motorized train play is compatible with most TrackMaster track and playsets Requires 2 AAA batteries Motorized TrackMaster engine collection Each engine is a great addition to your expandable, connectable, motorized Thomas & Friends TrackMaster world Motorized train play is compatible with most TrackMaster track and playsets Requires 2 AAA batteries