Run a single locomotive in front of high speed trains. Why?
Run the stripped down efficient locomotive far enough in front of a high speed train so that if it crashes the following train can stop in time. In the old days they called that a "scout" (someone who would go ahead to make sure the trail was safe). At the very least you could send a drone which would send back information to the engineer.
This just popped into my head, I don't know why.... OR we could just wait and see what happens when the next 200+ MPH train runs into a car, animal or tree.
Closing Statement from Keith W Henline
As my first experiment in TED conversations it served it's purpose.