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01/09/1897 Boston opens the first U.S. subway line

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Boston History in a Minute: First Subway in America

The Tremont Street Subway in Boston's MBTA Subway system is the oldest subway tunnel in North America and the 3rd oldest worldwide to exclusively use electric traction, opening in September 1897. It was originally built to get streetcar lines off the traffic-clogged streets, instead of as a true rapid transit line.
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