IT'S PART 2 OF THE EARLY HISRTORY OF THE INTERBOROUGH RAPID TRANSIT SYSTEM WITH THE CONSTRUCTION AND OPENING INFO:
https://en.wikipedia.org/wiki/Early_history_of_the_IRT_subway
PLEASE VISIT TWO GREAT CHANNELS:
PAULA CODO: https://www.youtube.com/channel/UCMtVReFqLquAAIliwtfFcOA
STUDENT LIFE MADE EASY: https://www.youtube.com/channel/UCFKhCV5YUcU75ngIiQbdb2Q
PHOTO BY: http://blog.nyhistory.org/subway/