The Strasburg Railroad is the oldest continuously operating railroad in the western hemisphere and the oldest public utility in the Commonwealth of Pennsylvania. Thomas The Tank Engine does visits there every year.
The official Thomas and Friends website.
Thomas Train Rides has information on Days out with Thomas The Tank Engine and his friends all around the world.
Sodor Island fan site is the official Thomas The Tank Engine Fan site around the world. As it has a lot of history on Thomas and his friends from the Railway Series Books to the Television series.