This aerial photograph shows a derailed freight train on Wednesday July 11, 2012 in Columbus, Ohio. Part of the freight train carrying ethanol derailed and caught fire early Wednesday, shooting flames skyward into the darkness and prompting the evacuation of a mile-wide area as firefighters and hazardous materials crews monitored the blaze. (AP Photo/The Columbus Dispatch, Doral Chenoweth III) MANDATORY CREDIT
COLUMBUS, Ohio (AP) — Investigators say a train that partly derailed and exploded in Columbus, Ohio, was traveling below the speed limit before the crash, and its operators noticed no problems with the track as they approached the curve where it happened.
The National Transportation Safety Board is investigating what caused the Wednesday derailment on Norfolk Southern Corp. tracks north of downtown.
Three tank cars carrying ethanol exploded. No one on the train was hurt. Two people were injured while walking on the tracks to investigate when a second explosion occurred.
Investigators are reconstructing the rails in hopes of spotting any anomalies. The full investigation could take a year.
Board member Earl Weener says the track had been visually inspected Monday and had undergone more thorough testing in April during an annual inspection.
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