The two tracks on the north side of the Manhattan Bridge formerly carried trains to the BMT Broadway Line, which now connects to the tracks on the south side of the bridge. The south side tracks had been connected to the BMT Nassau Street Line, carrying the Nassau Street Loop service via Chambers Street from 1915. The northern tracks of the bridge saw heavier traffic loads because it led to Midtown Manhattan, compared to the southern tracks, which made three stops in Lower Manhattan before returning to Brooklyn. As a result of the uneven traffic distribution, the Manhattan Bridge started tilting to its north side. The connection to the Nassau Street Line was cut north of Chambers Street at the Manhattan Bridge end, and is used for storage from the Nassau Street end.