This is the same signaling used by most of the NYC subway system and (if I understand correctly) is the reason they can't simply add more trains to the tracks d

This is the same signaling used by most of the NYC subway system and (if I understand correctly) is the reason they can't simply add more trains to the tracks despite the current overcrowding at times. https://en.wikipedia.org/wiki/Signaling_of_the_New_York_City_Subway https://en.wikipedia.org/wiki/Signaling_of_the_New_York_City...