Grand Central Terminal is a commuter rail terminal at 42nd Street and Park Avenue in Midtown Manhattan, New York City. Grand Central is the southern terminus of the Metro-North Railroad's Harlem, Hudson and New Haven Lines, serving the northern parts of the New York metropolitan area. It also serves the Long Island Rail Road through Grand Central Madison, a 16-acre (6.5 ha) addition to the station located underneath the Metro-North tracks, built from 2007 to 2023. The terminal also connects to the New York City Subway at the Grand Central–42nd Street station. The terminal is the third-busiest train station in North America, after New York Penn Station and Toronto Union Station.