TrackMaster motorized engines from Fisher-Price let 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. BML10 - Thomas & Friends TrackMaster Motorized Henry Engine