This is one of those awful tabloid-perfect horror stories that really drives home the fragile and arbitrary nature of life in the big city. In March of this year, Arabell Lin was walking between cars on a south-bound N train when she slipped and fell beneath the train, triggering a motion sensor that automatically fired the emergency brakes.
The conductor then descended to the tracks and looked around (for seven minutes) for whatever was causing the blockage; finding nothing, he got back in the train and moved it on to the next station. Ten more trains would pass over Lin's body before it was discovered. That driver has since been demoted to tower duty.
One can only hope Lin died instantly, after the initial fall. (Be careful out there, and make sure your loved ones know you love them.)