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 (sold separately) Requires 2 AAA batteries TrackMaster motorized engines from Fisher-Price have been redesigned, so you experience the Island of Sodor like never before! With enhanced speed and performance, these engines go faster and climb steeper inclines, driving Thomas & Friends to greater speeds, taller heights and bigger adventures! Flip the switch and watch them race along on another exciting journey. They're the perfect addition to your collectable, expandable, motorized TrackMaster world! Requires 2 AAA batteries.