Redesigned TrackMaster engines feature enhanced speed and performancenEach engine is a great addition to your expandable, connectable, motorized Thomas u0026amp; Friends TrackMaster worldnMotorized train play is compatible with most TrackMaster track and playsets (sold separately)nRequires 2 AAA batteriesnPerfect addition to your collectable, expandable, motorized TrackMaster world!nTrackMaster 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 u0026 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.