The 59th Street station is a never-opened station in the Park Avenue Tunnel used by the Metro-North Railroad. The station was built by the New York Central & Hudson River Railroad as part of an agreement with the government of New York City during the late 1870s, although trains never stopped here. The station is used as an emergency exit for the Metro-North Railroad.

The Park Avenue main line, which consists of the Park Avenue Tunnel and the Park Avenue Viaduct, is a railroad line in the New York City borough of Manhattan, running entirely along Park Avenue. The line carries four tracks of the Metro-North Railroad as a tunnel from Grand Central Terminal at 42nd Street to a portal at 97th Street, where it rises to a viaduct north of 99th Street and continues over the Harlem River into the Bronx over the Park Avenue Bridge. During rush hours, Metro-North uses three of the four tracks in the peak direction.