The Queens-bound track of the Grant Avenue subway station in City Line, East New York, Brooklyn. That big box down the track is the mezzanine / station house.
<a href="//commons.wikimedia.org/wiki/User:Tdorante10" title="User:Tdorante10">Tdorante10</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>