A little history: What we know now as the was actually created in 1989 out of three distinct, non-intersecting elements:
the original , which ran along Williamsbridge Road north of Westchester Square;
the original , Which ran along Crosby Avenue from Buhre Avenue station to Schley & Ellsworth;
the Locust Point branch of the original .
(Before 1989, the had three branches: Fort Schuyler via Edgewater Park, Locust Point via Edgewater Park, and Harding Avenue. As part of a major route restructuring, the was merged with the and extended to Edgewater Park and Locust Point. The Fort Schuyler branch of the was removed from Edgewater Park and the Harding Avenue branch was relabeled as .)