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170th Street is a local station on the Concourse Line. The full time side is actually at 171st Street at north end, with a crossover mezzanine, two street stairs, and two stairs to each platform. There are two platform level part time sides, one for each platform that were connected to the underpass at 170th Street tunnel. This area is now abandoned. The northbound side was exit-only with one street stair and the southbound side had two street stairs and a booth. Original signs to 170th Street underpass still exist on the station wall near the closed staircases.
South of this station, there is a fourth track next to the Manhattan-bound local track. It ends at bumper block and goes nowhere except merging with the adjacent track. This gives the clearest evidence that then Mayor John Hylan and the IND wanted a four track line in the Bronx to give the most leverage in competing directly with the IRT Jerome Avenue Line and the former Ninth Avenue Line to the west and to their hopes that the el will be torn down. Evidently, they had better success with the Third Avenue Line than the Jerome line. The platforms were most likely designed later, but before the 1933 completion of the line, as the plans were scaled back to the current three track configuration.