In 1940, the City of New York purchased the New York, Westchester and Boston Railway, and began integrating the line into the system. Plans were made for restoring the old line north into Westchester County, but ultimately failed, and the superfluous track and overhead catenary on the old NYW&B were scrapped by 1943. The section below East 180th Street to Greens Farm Junction was once used to interchange with the New Haven (and later Penn Central and Conrail) to bring subway cars and other equipment on and off the system. That section was removed in the 1970s, isolating this part of the subway from the interchange.