Sometime soon, investigators will piece together why one train on Metro's Red Line hurtled into another last week, killing nine people and injuring dozens. Early indications suggest a computer system may have malfunctioned, and various accounts have raised questions about whether the driver of the speeding train applied the brakes in time. The problem, said several experts who have studied such accidents, is that these investigations invariably focus our attention on discrete aspects of machine or human error, whereas the real problem often lies in the relationship between humans and their automated systems.

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