This handout photo provided by the National Transportation Safety Board (NTSB) shows damage from the arcing incident in the tunnel near L'Enfant Plaza Metro Station in Washington. Investigators say an electrical malfunction that filled a Washington subway train with smoke continued for 44 minutes before the Metro transit agency shut off power to the affected rail. The NTSB released a preliminary report on the accident Friday. One woman was killed and more than 80 people were sickened by smoke when the train stopped in a tunnel near the L'Enfant Plaza station Monday afternoon. (AP Photo/NTSB)
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