Your guide to the art along the Green Line Use this guide to plan your tour of Trinity Mills Station. To residents of today, Trinity Mills may just sound like the name of a road. In fact, it's a reference to the grain and gravel industry that grew up around the Elm Fork of the Trinity River in Carrollton. The art project at Trinity Mills Station points to this history. Artists Charlotte Lindsey and Larry Enge, operating in partnership under the moniker Montage 48/61, used a thin ribbon of colored concrete to represent the river and a circular millstone to represent the movement of a mill wheel. Located at the station entry point, the circle also symbolizes the seasonal cycles of farming.