Tremont Street Subway
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The Tremont Street Subway is a tunnel in Boston's subway system, and is the oldest subway tunnel in North America, opening on September 1, 1897. It was originally built as a tunnel to get streetcar lines off the streets, rather than a rapid transit line. It now forms the central part of the Green Line, connecting the Park Street station to Government Center.
The tunnel originally serviced stations at Park Street, Scollay Square, and Adams Square. The latter two stations were demolished when Government Center and City Hall replaced Scollay Square and Adams Square in 1963. The original entrances were in the Public Gardens, at North Station/Canal Street, and at Pleasant Street. The Pleasant Street tunnel still exists as of March 2006, but is disused. The other portals have been closed as the line has been further extended.
From its inception, the subway used trolleys powered by electricity from overhead lines, made possible by the invention of the trolley pole in 1880 by Frank J. Sprague.[1]
The Tremont Street Subway is now a National Historic Landmark.