After three deaths in New York with people falling on the tracks it makes me wonder why engineers can't come up with a bunch of sensors which will slow and stop the oncoming train. I mean serious? It doesn't take a rocket scientist to figure out that sensors in the landing area would detect movement then send a signal to the train telling it to slow down. Then as they train comes in to the station, sensors on the front of the train would stop it completely if a person or object was detected.
I thought this was such a good idea I sent off an email tot he Mayor's office of NYC and I got a typical response back "thanks, we will take it under advisement".