The Second Avenue Subway is chained as "S". The track map in the 2004 FEIS showed that all stations, except for 125th Street, would have two tracks and one island platform. 72nd Street and 125th Street were conceived as three-track, two-platform stations. 72nd Street was eventually scaled down to a two-track, center island platform station in order to reduce costs, A three-tracked 72nd Street station would have allowed trains from the Broadway Line to short-turn (reverse) without interfering with mainline service on Second Avenue, as well as provided additional operational flexibility for construction work and non-revenue moves. In July 2018, the 125th Street station was also scaled down to a two-track, one-platform station because the MTA had ascertained that two-tracked terminals would be sufficient to handle train capacities, and that building a third track would have caused unnecessary impacts to surrounding buildings.