The United States of America, or United States, simply known as America, the US or the USA, is a federation in North America consisting of fifty states and several overseas territories (in both the continents of North America and Oceania). Thomas visited this country a few times in Really Useful Around the World, and later in Big World! Big Adventures!, including the San Francisco Bay Railroad.

Several engines originate from the United States and come to work on Sodor permanently or temporarily, or simply to visit.


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