This complex currently serves the IND F line as the elevated Fourth Avenue station, with the BMT R and rush hour M trains downstairs as the underground 9^th Street station. The station complex is another example of a lost era in the IND’s history, as the description for the F line platforms will show you. This complex sits at the end of Park Slope.

IND F line-Fourth Ave (West side of 4^th Ave between 9^th and 10^th Streets) opened 7/1/1933: This station is a classic example of forgotten IND system; it currently has 2 side platforms on 4 tracks and is elevated. At the south end, the F train dips into a tunnel instantly. It is considered a local stop, as the southbound express track is used to relay G trains back to Smith-9^th Street. When the station first opened, the archway over 4^th Ave had huge windows, affording one of the best views in Brooklyn, and a platform canopy on both sides. The station also had 2 platform level entrances, one on each side on 4^th Ave between 9^th and 10^th Streets. Today, the station is in need of TLC as all windows are covered with paint, or boarded up. There is no view anywhere along either platform, except for the sky. The platform canopies are deteriorating, some areas have gaping holes. One of the 2 original entrances are sealed, east side of 4^th Ave would have ghost booth now. The F/T IND entrance is on the west side of 4^th Ave, with access points to 4^th Ave, and on 10^th Street. Transfers to either BMT platform are divided into 2 sections, the first section to the north of 4^th Ave (on the west side and the F/T booth area), has 3 stairs to an intermediate level, and 1 staircase down to street level. Off to one side at fare control is the staircase to the Bay Ridge/Bay Parkway bound side of the R and M lines, respectively (the D and N trains stop at this station when the R is not running north of 36^th Street during late nights.). The second section is at the far southern end of this platform and has 1 staircase to each side down to the sealed mezzanine and staircase to the Manhattan-bound BMT platform. Outside both stationhouse entrances are the classic IND Victorian style designs with "SUBWAY" in vertical letters. On each platform, there is 1 up staircase; it is for NYCT employee use only. An active tower is to the north of the Manhattan-bound IND platform and controls the switches north of this station, including G train relay movements to and from Smith 9^th Street. A little know fact at this station, inside both fare control areas at the wall between the up staircases are former locations of special light bulbs, one for each side. They are the equivalent to today’s LED Next Train Indicators as when a train approached this station, the light bulb would be lit.