Watch him chug chug along while talking to you! The TrackMaster Spencer Engine is only compatible with other TrackMaster trains and track sets. No track pieces included. Requires 3 AAA batteries. The TrackMaster Railway pieces are larger than the other railway lines and are made of quality plastic with the engines and trains running on battery power. The TrackMaster Motorized Railway is perfect for fueling the imagination of young engineers! Spencer and train car measure approximately 9" long.