The first portion of the line, between the 36th Street station on Fourth Avenue and 62nd Street station, opened on June 24, 1916 with two tracks. On the same date, the line opened three more stations to 18th Avenue, but with only one track in service. The second track between 62nd Street and 18th Avenue opened on July 8, 1916. The line was then extended to 25th Avenue on July 29, 1916. The line opened to and fully opening to Coney Island on July 21, 1917. The original surface right-of-way was retained for use by trolley cars to provide local service and protect the company's franchise.