Frank Julian Sprague

William D. Middleton is the author of more than 20 books and many hundreds of articles on rail transportation, engineering, and travel topics. He is editor (with George M. Smerk and Roberta L. Diehl) of Encyclopedia of North American Railroads (IUP, 2007).

William D. Middleton III is a contributor to the Encyclopedia of North American Railroads (IUP, 2007).

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