The Charlestown Elevated was a former segment of Boston's Orange Line rapid transit line that ran from the Canal Street Incline in parallel with the Causeway Street Elevated (near the old Boston Garden), splitting from the Causeway Elevated's right-of-way by running to the northeast around the Boston Garden, and then resuming its northwards run to the city of Everett through Charlestown. Building of the elevated began in 1899 and the first trains ran in June 1901, with the Atlantic Avenue Elevated tracks splitting off to the east between North Station and City Square from the northwards turn towards Everett until the Atlantic Avenue El's own closure in 1938.
The Orange Line was rerouted to Malden via an underground route and surface-level route - the Haymarket North Extension - in 1975, the first of two major realignments of the Orange Line. (The Washington Street Elevated was rerouted in 1987). The Elevated closed on April 4, 1975, and the new extension opened on April 7.
The elevated was demolished shortly after its closure; Sullivan Square was demolished in July 1975. Remains of the bridge over the Mystic River still[when?] exist just west of the Route 99 (Alford Street) bridge, and a line of angled stone remains of the Canal Street Incline. The elevated supports can also be seen in the center span of the Charlestown Bridge. Tower C, which was located at the split between the Charlestown Elevated and the Atlantic Avenue Elevated at the southern end of the Charlestown Bridge, was moved to the Seashore Trolley Museum.