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July 4 – Baltimore and Ohio Railroad's Thomas Viaduct, the first multiple arch stone masonry railroad bridge in the United States, is officially completed. It is also the longest bridge of any kind in the nation, and second longest in the world, next to London Bridge.
White, John H. Jr. (1968). A history of the American locomotive; its development: 1830–1880. New York, NY: Dover Publications. ISBN0-486-23818-0.
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