CNN CNN Tonight May 13, 2015 02:19:00
Now, the car system where the cars will actually absorb the energy kind of like a crush zone in a passenger car, but they will absorb the energy. that's one way to help. and then for train -- other trains on the track and other problems of actually moving the trains and scheduling the trains on the track, there's another system called positive train control, that rail lines are working to implement. unfortunately, sometimes people don't realize is that the train is traveling over the track. that rail line or that train line doesn't always own and often doesn't own the track that it's traveling...