The terminal serves commuters traveling on the Metro-North Railroad to Westchester, Putnam, and Dutchess counties in New York, as well as to Fairfield and New Haven counties in Connecticut. Grand Central Terminal has intricate designs both on its inside and outside, lending to its landmark designations, including as a U.S. National Historic Landmark. The terminal is one of the world's most visited tourist attractions, with 21.9 million visitors in 2013.
The station was built by and named for the New York Central and Hudson River Railroad in the pinnacle of American long-distance passenger rail travel. Until 1991, the terminal also served Amtrak, which moved to nearby Pennsylvania Station upon completion of the Empire Connection. The East Side Access project is underway to bring Long Island Rail Road service to the terminal.
Grand Central covers 48 acres (19 ha) and has 44 platforms, more than any other railroad station in the world. Its platforms, all below ground, serve 30 tracks on the upper level and 26 on the lower, though only 43 tracks are currently in use for passenger service. The total number of tracks along platforms and in rail yards exceeds 100 as most previous tracks that are not in regular use are used for the rail yard. Unlike other Metro-North stations, Grand Central Terminal is not owned by the Metropolitan Transportation Authority, but by a private company known as Midtown TDR Ventures.