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The DC Metro used to be driven by computer and the drivers were only there to make announcements and to open the doors.
Then there was the accident because of the faulty track sensors, so now the drivers drive the trains again. There have been two driver error accidents since that switch was made.
Out at Dulles airport, the trains to the far terminals have no drivers at all. Everything is automated, and they are much smoother riding than Metrorail ever was.
I think when the system works, computer controlled vehicles are better. But we've all seen how computers can fail.
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