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History of rail transportation in the United States - Wikipedia
Timeline of United States railway history - Wikipedia
Railroad - Early American, Steam Engines, Expansion | Britannica
Steam Locomotives (USA), The Classic "Iron Horse" - American-Rails.com
The Evolution of the American Locomotive.
A history of the American locomotive : its development, 1830 …
Locomotive | Definition, History, Design, Types, & Facts | Britannica
History of technology - Steam Locomotive, Railroads, Industrial ...
Railroad History - RLHS
Locomotives - The Linda Hall Library