Daniel Patrick Moynihan Train Hall is an expansion of New York City's Pennsylvania Station into the adjacent James A. Farley Building, the city's former main post office building. Located between Eighth Avenue, Ninth Avenue, 31st Street, and 33rd Street in Midtown Manhattan, the annex provides new access to most of Penn Station's platforms for Amtrak and Long Island Rail Road passengers, serving 17 of the station's 21 tracks.
A first phase, involving an expansion of a concourse under the Farley Building, started in 2010 and was completed in June 2017. Construction of the train hall proper commenced in 2017. The train hall opened January 1, 2021, and is named for Daniel Patrick Moynihan, the U.S. Senator who had originally championed the plan.