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12 was theBrooklyn-Manhattan Transit Corporation's designation for trains that used theBMT Lexington Avenue Line. This number was used on service listings on company maps, but was never displayed on train equipment, nor were trains referred to as "12 trains" in the manner of the current system, but were calledLexington Avenue Line trains.
TheBMT assigned numbers to its services in 1924, and12 was applied to trains betweenPark Row andEastern Parkway via theBrooklyn Bridge,BMT Myrtle Avenue Line,BMT Lexington Avenue Line andBMT Jamaica Line. Duringrush hours, service extended east toCrescent Street; some afternoon rush hour trains continued to111th Street or168th Street.
Between 1925 and 1931, all rush hour service was extended to 111th or 168th Street. In addition, some afternoon rush hour trains were added betweenSands Street (on the Brooklyn side of the Brooklyn Bridge) and 111th Street.
By 1937, normal service had been truncated to the Brooklyn side of the bridge; rush hour trains still crossed the bridge to Park Row. Additionally, trains no longer ran to 168th Street, with all rush hour trains going to 111th Street. The extra afternoon rush hour trains from Sands Street to 111th Street remained.
On May 31, 1940, service was ended on theBMT Fulton Street Line west ofRockaway Avenue and the full length of theBMT Fifth Avenue Line andBMT Third Avenue Line. All Lexington Avenue trains were once again extended across theBrooklyn Bridge toPark Row, and a new service calledFulton – Lexington Avenue was inaugurated, replacing service that had been provided by Fulton Street trains, and operating to the Fulton Street Line terminus atLefferts Avenue.
On March 5, 1944, theBMT Myrtle Avenue Line was closed west of Jay Street and the Bridge Street station at that location was renamedBridge–Jay Streets; all12 trains were truncated there (with a free transfer first to streetcars, and then to theIND atJay Street – Borough Hall) – seeList of New York City Subway transfer stations for details.
By 1948, Fulton – Lexington Avenue trains were truncated toGrant Avenue. TheBMT Lexington Avenue Line closed on October 13, 1950, ending all12 service.