There are 472 stations in the NYC Subway system (which is controlled by the State Governor). The stations are a mixture of underground, elevated, embankment, or open-cut stations. Riders need stairs to access the concourse and platforms.
I find the context around the stairs more interesting than the stairs themselves: a microcosm of New York City at each stair.
These are examples of Sub ianua (train steps) from Manhattan, Brooklyn, and Queens. Often bollards are found nearby, as are post office boxes, Rota custodia (CityRack), Rota custodulus (Mini CityRack), and Sub operimentum (MTA subway sidewalk grate).