CNN Early Start With John Berman and Christine Romans May 15, 2015 08:25:00
Braking to avoid having an accident. if the engineer does not respond and does not slow down when necessary, the computer would then take over these the positive part of positive train control and it would slow down or stop the train to avoid an accident. this could, in theory stop a lot of things. if you put this system fully in place, you should have no more major train-to-train collisions and no errors with switching on the tracks or crews run into by trains and importantly, you would stop high-speed derailment with a train hitting a turn or overpass too fast to handle. that would happen be...
Source: archive.org