Coney Island–Stillwell Avenue (also known as Coney Island Terminal) in Coney Island, Brooklyn, is the world's largest rapid transit terminal facility, and notable as the most energy-efficient mass transit facility in the United States. It serves as a terminal for four different lines of the New York City Subway, and is served by D, F, N, and Q trains at all times. While labeled a terminal, six of the eight tracks could provide through service in either direction. The station has been used as a terminal for most of its history, but at least two through services have been offered: