The New York Central Railroad tested third-rail-powered electric trains in 1904, using a fleet of new MU Sprague-GE cars from the General Electric Company, and found that their speeds were adequate for service into Grand Central. Over the next few years, the New York Central and New Haven Railroads electrified their tracks, allowing trains to enter Grand Central Terminal upon its completion. The first electric train departed for the soon-to-be-demolished Grand Central Station, from the Harlem Division's Highbridge station in the Bronx, on September 30, 1906. By late 1906, Harlem Division trains were also electrified, and its operations moved to the basement of Grand Central Palace. New Haven Division electric trains started running to Grand Central in October 1907.