New York Connecting Railroad, completed 1917 Hell Gate Bridge (connected to Harlem River and Port Chester Railroad), opened 1917 Electrification, 1905–38 New York section In 1899, William J. Wilgus, the New York Central Railroad (NYC)'s chief engineer, proposed electrifying the lines leading from Grand Central Terminal and the split at Mott Haven, using a third rail power system devised by Frank J. Sprague. Electricity was in use on some branch lines of the NYNH&H for interurban streetcars via third rail or trolley wire. An accident in the Park Avenue Tunnel near the present Grand Central Terminal that killed 17 people on January 8, 1902, was blamed on smoke from steam locomotives; the resulting outcry led to a push for electric operation in Manhattan. The NH announced in 1905 that it would electrify its main line from New York to Stamford, Connecticut. Along with the construction of Grand Central Terminal, which was opened in 1913, the NYC electrified its lines. On September 30, 1906, the NYC conducted a test of suburban multiple unit service to Highbridge station on the Hudson Line; regular service began on December 11. Electric locomotives began serving Grand Central on February 15, 1907, and all NYC passenger service into Grand Central was electrified on July 1, 1907. NH electrification began in July to New Rochelle, August to Port Chester and October the rest of the way to Stamford. Steam trains last operated into Grand Central on June 30, 1908: the deadline after which steam trains were banned in Manhattan. Subsequently, all NH passenger trains into Manhattan were electrified. In June 1914, the NH electrification was extended to New Haven, which was the terminus of electrified service for over 80 years. The PRR was building its Pennsylvania Station and electrified approaches, which were served by the PRR's lines in New Jersey and the Long Island Rail Road (LIRR). LIRR electric service began in 1905 on the Atlantic Branch from downtown Brooklyn past Jamaica, and in June 1910 on the branch to Long Island City: part of the main line to Penn Station. Penn Station opened on September 8, 1910, for LIRR trains and November 27 for the PRR; trains of both railroads were powered by DC electricity from a third rail. PRR trains changed engines (electric to/from steam) at Manhattan Transfer; passengers could also transfer there to H&M trains to downtown Manhattan. On July 29, 1911, NH began