The South Brooklyn Railway (reporting mark SBK) is a railroad in the New York City borough of Brooklyn. It is owned by the City of New York and operated by the New York City Transit Authority. Its original main line ran parallel to 38th Street from the Upper New York Bay to McDonald Avenue, and south on McDonald Avenue to the Coney Island Yards, mostly underneath the former Culver Shuttle and the IND Culver Line of the New York City Subway.