One guess--if it was in Brooklyn and was a station with no tracks laid down (so never actually used as a station)--is that it was part of the IND second line. M

One guess--if it was in Brooklyn and was a station with no tracks laid down (so never actually used as a station)--is that it was part of the IND second line. Maybe the South 4th Street and Broadway station? This line was started just before the 1929 crash and never completed. See http://www.columbia.edu/~brennan/abandoned/indsecsys.html http://www.columbia.edu/~brennan/abandoned/indsecsys.html, there's a hand-drawn map down at the bottom.