Build & Play Train is yet another step along the way to becoming an Erector master builder. Specifically designed to be more project oriented, each set has enough parts to build two different models when the child follows the instruction booklet. The real creativity begins once kids learn that it's OK to depart from the instructions and build a few designs of their own! New flexible pieces have added a whole new dimension of fun to the creations a child's active imagination can come up with.