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Exists, yes, but is not installed throughout the US rail systems.
But there should still be a human on the trains. Automatic signaling won’t stop a train when there’s a stalled car on a crossing, or someone walking on the tracks.
A human on board won’t stop a train either. They will hit the brakes, but trains don’t stop fast enough to make a difference in those situations.
Feel free to consider other scenarios. That’s just the first that came to mind.
I’m willing to, but so far I’m not ware of any.