Union Street

Union Street is a local station on the BMT Fourth Avenue Line of the New York City Subway. It is located at the corner of Fourth Avenue and Union Street in Brooklyn, New York City, serving the communities of Park Slope, Gowanus and Carroll Gardens. It is served by the R train at all times except late nights, when the D and N assume local service along Fourth Avenue.
This underground station, opened on June 22, 1915, and has four tracks and two side platforms. The center express tracks are used by the D and N during daytime hours. A black and white curtain wall separates them from the local tracks.
Each platform has one same-level fare control area in the center and there are no crossovers or crossunders to allow free transfer between directions. The Manhattan-bound side has a fare control area, a turnstile bank, token booth, and two street stairs. The one on the Manhattan-bound platform goes up to the southeast corner of Union Street and Fourth Avenue while the one on the Bay Ridge-bound platform goes up to the southwest corner. The Bay Ridge-bound side has a fare control area, a turnstile bank, and two street stairs.