Dinosaur Train Season 4 Episode 9 What's at The Center of The Earth? Layers! / What's at The Center of The Earth? Fossils! Episode Title: What's at The Center of The Earth? Layers! / What's at The Center of The Earth? Fossils! Episode Description: Mr. P. and the kids join Mr. Conductor and Gilbert aboard the drill train to search for a location for a new underground train station. They learn about Earth's layers, meet Natasha Necrolestes, and find fossils from different time periods.