each platform, a turnstile bank, token booth, and access to the street exits. On the Brooklyn-bound side, there is a small sign reading "Change Radio Channel to B1", indicating that train operators must change the channel on the route destination box from B2 (IND) to B1 (BMT) before crossing the Manhattan Bridge. Southbound trains leaving this station cross over the north side of the bridge and arrive at DeKalb Avenue or Atlantic Avenue–Barclays Center (via the DeKalb Avenue bypass tracks). As the tracks curve onto the bridge, trackways from Canal Street on the Manhattan Bridge branch of the BMT Broadway Line are visible. The north side of the bridge originally led to that station before the current alignment was completed in 1967. Exits There are three staircase exits: two going up to the northeastern corner of the intersection of Grand and Chrystie Streets, and one going up to the northwestern corner. The station originally only had the two street stairs to the northeastern corner of the intersection, but due to growing ridership over the years—mainly by commuters from various Brooklyn neighborhoods to Manhattan's Chinatown—the third staircase to the northwestern corner was added in 1999. Artwork A painted frieze called Trains of Thought by Andrea Gardner and Sally Heller was installed at the mezzanine and platforms in the late 1990s as the "Creative Stations" program sponsored by the Lower Manhattan Cultural Council. It features red clay models of R62s and R62As mounted on wood. Second Avenue Subway plans In addition to connecting the BMT Nassau Street and IND Sixth Avenue Lines, as well as the Sixth Avenue Line to the Manhattan Bridge, the Chrystie Street Connection is one of the few completed sections of the SAS. The Grand Street station was built to serve as a transfer point between the Sixth Avenue and Second Avenue lines. The connection was built this way because the original 1960s plans for the SAS had Second Avenue and Sixth Avenue Line trains sharing two island platforms in a four-track layout, with connections from the Second Avenue Line to the Sixth Avenue Line and the Manhattan Bridge. Because Second Avenue Subway construction was halted in 1975, this station has only served Sixth Avenue Line trains since its opening. As part of the contemporary Second Avenue Subway construction, a new station is planned for construction below the current station during the fourth and final phase of the