Manhattan Bridge through Canal Street to 14th Street–Union Square, opened on September 4, 1917, at 2 P.M., with an eight car train carrying members of the Public Service Commission, representatives of the city government and officials of the BRT, leaving Union Square toward Coney Island. Service opened to the general public at 8 P.M., with trains leaving Union Square and Coney Island simultaneously. The line was served by two services. One route ran via the Fourth Avenue Line and the Sea Beach Line to Coney Island, while the other line, the short line, ran to Ninth Avenue, where passengers could transfer for West End and Culver Line service. The initial headway on the line was three minutes during rush hours, three minutes and forty-five seconds at other times, except during late nights when service ran every fifteen minutes. 28th Street station opened on January 5, 1918, as the BMT Broadway Line was extended north from 14th Street–Union Square to Times Square–42nd Street and south to Rector Street. Service at this station was provided by local services running between Times Square and Rector Street. Service was extended one station to Whitehall Street–South Ferry on September 20, 1918. On August 1, 1920, the Montague Street Tunnel opened, extending local service from Lower Manhattan to DeKalb Avenue in Downtown Brooklyn by traveling under the East River. Later years On August 6, 1927, bombs exploded at the 28th Street station and at the 28th Street station on the Lexington Avenue Line. Numerous passengers were injured, but there were no casualties, although investigators initially believed one person may have been killed. The perpetrator of the bombings is unknown; they were initially blamed on Galleanists, as Sacco and Vanzetti had been denied appeal three days prior, though police later believed they were unrelated. The city government took over the BMT's operations on June 1, 1940. The station was renovated in the 1970s to accommodate ten-car trains. As part of the renovation, the original wall tiles, old signs, and incandescent lighting were covered by modern-look wall tile band and tablet mosaics, and new signs and fluorescent lights were installed. Staircases and platform edges were also renovated. This station was renovated in 2001 by New York City Transit. It sealed off and removed any evidence of a crossunder outside fare control while false curtain walls were installed at the north ends of each platform, shortening them by 10