Colin is, on some level, grasping geography. He likes to talk about how Nana and Boppy live in Ashland, Kentucky, and Uncle Davey is in Lexington, Kentucky. Every river is either the Ohio River, or the Colorado River. The beach is in South Carolina, and the Island of Sodor is across the ocean.
And then there's Indiana. In Indiana, you can see the real Thomas, and you can buy fireworks. That's not to be confused with India, where his "Auntie Andrea" lives.