This is a great set for the younger child. It combines two loves - a battery operated train set (batteries included), and the popular Caterpillar brand. The set has 12 curved pieces and four straight pieces. It comes with its Caterpillar engine, Caterpillar caboose, and three Caterpillar cars, all of which are in superior condition. A wonderful gift for the train and / or Caterpillar enthusiast.