The line was extended two stops northward to 57th Street on July 10, 1919. Express service between Times Square and Union Square was inaugurated on this date. Previously, express service terminated at Union Square, with local service terminating at Times Square. Express service then began to terminate at Times Square, with local service terminating at the new 57th Street station. Express service between Manhattan and Pacific Street began to run at all times except late nights. The line was extended to Lexington Avenue/59th Street on September 1, 1919.