The BMT Jamaica Line, also known as the Broadway - Brooklyn Line, is an elevated rapid transit line of the B Division of the New York City Subway, in Brooklyn and Queens, New York City, United States. It runs from the Williamsburg Bridge southeast over Broadway to East New York, Brooklyn, and then east over Fulton Street and Jamaica Avenue to Jamaica, Queens. In western Jamaica, the line goes into a tunnel, becoming the lower level of the Archer Avenue lines in central Jamaica. The J and Z trains serve the entire length of the Jamaica Line, and the M serves the line west of Myrtle Avenue.

The Williamsburg Bridge is a suspension bridge across the East River in New York City, connecting the Lower East Side of Manhattan with the Williamsburg neighborhood of Brooklyn. Originally known as the East River Bridge, the Williamsburg Bridge was completed in 1903 and, at 7,308 feet (2,227 m) long, was the longest suspension bridge span in the world until 1924.