As such, the tracks connecting to the IND Sixth Avenue Line comprise the IND 63rd Street Line, on the south side of the station, while the tracks connecting to the BMT Broadway Line comprise the BMT 63rd Street Line, on the north side of the station.
As a result, the paths connecting to the IND Sixth Avenue Line consist of the IND 63rd Street Line on the southern part of the station, whereas the tracks that connect to the BMT Broadway Line are formed by the BMT 63rd Street Line on the northern side of the station.