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The Burrowing STEM Engine is a colorful and awe-inspiring toy train set that kids can pretend is able to burrow deep into the ground. Kids can assemble this toy train set themselves, using a toy power drill and the 25 bolts that can fix the different train parts together. Once it is safe for Tony the Conductor to board the train, you can begin your adventure! Take the Burrowing STEM Engine on all kinds of journeys through many terrains.