Washington Street Tunnel (Boston)

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The Washington Street Tunnel is a subway tunnel in downtown Boston, Massachusetts. The tunnel was originally opened in 1908 to carry trains of the Boston Elevated Railway's Main Line, linking together that railway's Charlestown, Washington Street and Atlantic Avenue elevated lines.

Today the tunnel is used by the section of the Orange Line of the MBTA between Haymarket and Chinatown stations. The three elevated lines have all been demolished, although the outer sections of the Orange Line somewhat replace the first two.