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When numbers were assigned in 1924, 6 was assigned to trains between Sands Street (on the Brooklyn side of the Brooklyn Bridge) and 65th Street, via the BMT Myrtle Avenue Line, BMT Third Avenue Line, and BMT Fifth Avenue Line.
Between 1931 and 1937, all service except rush hour and Saturday morning service was truncated to 36th Street, where transfer could be made to a Culver Line (5) train to downtown Brooklyn. On May 31, 1940, the Third Avenue and Fifth Avenue lines were closed, ending all 6 service.
- NYCsubway.org - Historical Maps
- BMT-Lines.com - Service/Maps
- B.M.T. 'El' Lines to Shift Service; City to Close 2 Sections This Week, New York Times May 27, 1940 page 19