and Putnam Railroad spur remained until 1999. As part of the construction of Grand Central Terminal in the early 1900s, all of New York Central's lines that ran into the terminal were electrified. Third rail was installed on the Hudson and Harlem Divisions, while the New Haven Division received overhead wires on the segments that were not shared with the Harlem and Hudson Division. The first electric train departed for the temporary Grand Central Station, from the Harlem Division's Highbridge station in the Bronx, on September 30, 1906. Electrification would eventually extend to Croton–Harmon station. The former main line south of Spuyten Duyvil remained for freight to the docks along Manhattan's west side and minimal passenger service to the West Side Station on Chambers Street (used until 1916). Passenger service on this line, which became known as the 30th Street Branch continued until late 1929 or early 1930. The New York Central operated many intercity and commuter trains over this line for many years. It was a key route in connecting Grand Central Terminal in New York to LaSalle Street Station in Chicago. Commuter service along the line was offered as far north as Albany Union Station, with 121 trains serving Albany per day during the NYC's peak years. The line last offered one train a day weekday service to intermediate local stations between Poughkeepsie and Albany (aside from Rhinecliff and Hudson, which persist today under Amtrak service) from Grand Central until it fell from the schedule in 1959. Hyde Park last appeared on the schedule in 1958. Penn Central and Conrail At the end of World War II, private rail service began a sharp decline with the start of the Jet Age and the construction of the Interstate Highway System. NYC, facing declining year-over-year profits, merged in 1968 with its former rival, the Pennsylvania Railroad, forming the Penn Central Transportation Company. Penn Central continued to lose money and attempted several maneuvers to delay bankruptcy, including auctioning off the air rights of Grand Central Terminal; the Pennsylvania Railroad had done the same thing to Penn Station. However, this approval was denied, and the denial was affirmed in Penn Central Transportation Co. v. New York City, a 1978 decision by the United States Supreme Court. On May 1, 1971, the National Railroad Passenger Corporation took over all intercity passenger service in the US. Penn Central continued to operate freight and commuter