The National Transportation Safety Board says two days before a train derailed in Connecticut last month and injured more than 70 people a track inspection found problems where the derailment occurred.
The NTSB said Wednesday the inspection on May 15 found an insulated rail joint with inadequate supporting ballast and indications of vertical movement of the track system.
NTSB says sections of rail in the area of the derailment containing rail joint bars were removed and shipped to a lab in Washington for further examination.
NTSB has previously said a joint bar, used to hold two sections of rail together, had been cracked and repaired while a rail spokesman says it was replaced.
Metro-North railroad is conducting an inspection and inventory of all the joint bars on its main tracks.
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