The Take-n-Play Train Maker (sold separately) lets you build your own engines in just a few easy steps! Just load three train parts into the hopper and load the chassis onto the platform. Pull the handle to raise the chassis up to the assembly line, then press the plunger three times… the engine advances down the assembly line as the hoppers drop parts onto the chassis! The Train Maker Monster Pack provides additional parts and pieces for use with the Train Maker set so you can create even more engines! You can also put the pieces together by hand. Includes one chassis, six Diesel and Max engine body parts and four accessory pieces.