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On January 24, 1913, construction began on Route 11B2, which includes this station and extends between 61st Street and 89th Street. Construction was completed on this section in 1915. 77th Street opened on January 15, 1916 as part of an extension of the BMT Fourth Avenue Line from 59th Street to 86th Street.
The platforms were originally 435feet long, allowing for six-car local trains. On February 16, 1925, the Board of Transportation directed its engineers to prepare plans to lengthen the platforms at twelve stations along the Fourth Avenue Line, including this station, to accommodate eight-car trains at the cost of $633,000.
B1 Mezzanine Fare control, station agent
B2 Side platform, doors will open on the right
Northbound ← toward Forest Hills–71st Avenue (Whitehall Street late nights) (Bay Ridge Avenue)
Southbound → toward Bay Ridge–95th Street (86th Street) →
Side platform, doors will open on the right
This underground station has two side platforms and two tracks. Both platforms have cinder-block tiles installed during a 1970s renovation. The original trim lines were replaced with white cinderblock tiles, except for small recesses in the walls, which contain orange-painted cinderblock tiles. The staircases were repaired and new platform edges were installed. The orange cinderblock field contains the station-name signs and white text pointing to the exits. The renovation also replaced incandescent lighting with fluorescent lighting.
Both platforms have yellow columns that run at regular intervals along the entire length. Alternating ones have the standard black and white station name plate. The columns are round in the center and i-beams at either ends (where the platforms were extended in the 1950s to accommodate the current standard length of a B Division train of 600 feet).
The station is built on the west side of Fourth Avenue due to plans for a possible extension of the express tracks south of 59th Street. As a result of the possibility of the extension of the express tracks, there is space underneath the northbound platform for an additional trackway at this station for the Bay Ridge-bound express track. This also can be found at Bay Ridge Avenue.
The station's full-time entrance is a mezzanine at the south end above the platforms and tracks. Two staircases from each platform go up to a waiting area/crossover, where a turnstile bank provides entrance/exit from the system. Outside fare control, there is a token booth and two staircases going up to either northern corners of 77th Street and Fourth Avenue. The northwest staircase has its original ornate banisters and railings. Inside the mezzanine, there are mosaics indicating a newsstand and two restrooms, all of which are now defunct, and directing to each platform.
In addition, the Bay Ridge-bound platform has an exit-only at the north end. A single platform-level exit-only turnstiles leads to a double flight staircase that goes up to the northwest corner of 76th Street and Fourth Avenue. The landing here has the station's original trim line with "77" tablets on it.