Atlantic Avenue-Barclays Center (originally Pacific Street then Atlantic Avenue-Pacific Street) is an express station on the BMT Fourth Avenue Line that has four tracks and two island platforms.
At the north end of the BMT Fourth Avenue platforms, two staircases and one elevator go up to the main fare control area, where a turnstile bank provides access to/from the station and two staircases going up to either northern corners of Pacific Street and Fourth Avenue.