Season 4 Episodes20
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The Conductor takes the Pteranodon family on a very special journey on a new invention - the Drill Engine Train - in search of the perfect spot for a new Underground Dinosaur Train Station! Don is THRILLED to be venturing into the BIGGEST HOLE THE
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"What's at the Center of the Earth? (1): Layers" is episode 17 of Dinosaur Train season 4. It aired on February 20, 2017.