platforms were extended . The northbound was extended to the north, and the southbound platform was extended to the south. In addition, the station's elaborate mosaic tile walls were covered over with white cinderblock tiles. The latter change, which was also made to 15 other stations on the BMT Broadway and Fourth Avenue Line, was criticized for being dehumanizing. The NYCTA spokesman stated that the old tiles were in poor condition and that the change was made to improve the appearance of stations and provide uniformity. Furthermore, it did not consider the old mosaics to have "any great artistic merit". Station layout This underground station has four tracks and two side platforms. The R stops here at all times; some rush-hour W trains stop here in the peak direction; and the N stops here during late nights, but uses the center express tracks to bypass the station during daytime hours. The platforms are offset as the northbound platform extends further north than the southbound one. Columns run along the entire length of both platforms at regular intervals and are painted dark grey-blue. Every other column has the standard black name plate with white text. All are round except for the ones near the staircases to the station's main entrance, which are I-beams; this is where the platforms were extended in 1970. Prior to the station's 1970 renovation, it was finished all in white and marble tile, and it had its own color scheme to allow regular passengers to identify the station based only on the color of the marble trimmings. Since the renovation, the station walls have consisted of white cinderblock tiles, except for small recesses in the walls, which contain gray-painted cinderblock tiles. The gray cinderblock field contains the station-name signs and white text pointing to the exits. Exits The station's main entrance is a mezzanine above the platforms and tracks at the north end. It has two staircases to the Manhattan-bound platform and one to the Bay Ridge-bound one at the extreme south end, a waiting area that allows a free transfer between directions, turnstile bank, token booth, and two staircases to the northern corners of 45th Street and 4th Avenue. The mezzanine contains some of the original mosaic directional and arrow signs. The one by the staircases to the southbound platform says "Down Town trains" while the one by the Manhattan-bound platform staircases says "Up Town Trains."