There used to be one of Clark Dunham's layouts on display in Williamsburg Va in the Village Shops @ Kingsmill, near Busch Gardens. It was called America's Railrods on Parade. I saw it about five years ago, and it was just about the most beautiful display I ever saw.
IIRC the layouts had originally been displayed at Citicorp in NY about ten years ago, or at least so I was told. The Williamsburg layout closed about a year ago, and the displays went back to Clark Dunham.
I wonder if this same display is the one that is back in NY.