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It makes me wonder about the wisdom of having the trains run by computer and the drivers just there as a back-up. The computers ensure that accidents virtually never happen, but when they do, the driver isn't at 100% attention, so they don't always catch it right away. On the other hand, if the drivers were in complete control all the time so that they were paying attention, human error would eventually creep in, and there would probably be more accidents.
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