Second Avenue has two island platforms and four tracks. F trains run on the outer tracks, while the inner tracks are not used in regular service. When the station opened, all four Sixth Avenue tracks ran continuously from West Fourth Street through Second Avenue. During the construction of the Chrystie Street Connection in the 1950s and 1960s, the center express tracks at Broadway–Lafayette Street were severed from the tracks at Second Avenue and rerouted to the Chrystie Street subway, running through Grand Street station to the north side of the Manhattan Bridge.