After a year that saw the most deaths on MTA-operated tracks since 2008, the agency is testing out new technology for safety reasons. The goal is to employ motion sensor technologies to warn conductors about track interference and warn conductors in time, if need be.
Below are the four options the MTA is weighing:
Closed-circuit television cameras and “intelligent video” computer software that recognizes when a large object moves from the platform to the tracks.
Laser beams that stretch across the tracks that, when broken, triggers an alarm and other components.
Radio frequencies transmitted across the tracks just beneath the platform edge.
Thermal-image cameras, which identify the heat emitted from a person, focused on the station’s tracks.
As Gothamist notes, the most effective technology out there is your own common sense. That shouldn't need testing and it's free.