The Smith Street Line was a public transit line in Brooklyn, New York City, running mostly along Ninth Street and Smith Street between Park Slope and Downtown Brooklyn. Originally a streetcar line, and later the B75, it is now split between two bus routes: the B57 (Cobble Hill section) and the B61 (Park Slope section). The B67, which supplemented service in Downtown Brooklyn along Jay Street before the elimination of the B75, continues to serve that section of the route. The B61 is operated by MTA New York City Bus' Jackie Gleason Depot in Sunset Park, and the B57 is dispatched from the Grand Avenue Depot in Maspeth, Queens.