The first section of the line ran over Myrtle Avenue from Johnson and Adams Streets to a junction with what was then known as the Main Line at Grand Avenue and was opened on April 10, 1888 by the Union Elevated Railroad Company, which was leased to the Brooklyn Elevated Railroad for its operation. Trains continued along Grand Avenue and Lexington Avenue to Broadway, where the line joined the Broadway Elevated, and then along Broadway to East New York. On September 1, 1888, the line was extended westward along Adams Street and Sands Street, to a terminal at Washington Street for the Brooklyn Bridge. On April 27, 1889, the line was extended east along Myrtle Avenue to Broadway.