That would be a great way to reduce the risks but the cost is so outrageous that it's really unlikely to ever become a reality. Even if it were on it's on track human error leads to catastrophe....this accident was human error, had the engineer followed procedure then the two trains would have passed safely. I won't speculate on the story that has come out about how he was texting with some teen...it could have been exhaustion, hell he could have had a heart attack in which case it wasn't human error but just a tragedy. Separate tracks would reduce the risk but not eliminate it.
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"Sometimes Miracles Hide"
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