The National Transportation Safety Board says a track inspection found problems two days before a train derailed in Connecticut and injured more than 70 people.
The NTSB said Wednesday that the May 15 inspection found a rail joint with inadequate supporting ballast and indications of vertical movement of the track.
The agency says rail sections were shipped to a lab for further examination.
Marjorie Anders, a Metro-North spokeswoman, says the ballast is loose stone and the railroad constantly makes sure it's packed tightly so the track doesn't go up and down slightly when a train passes. She says the inspection noted the issue but it wasn't deemed an immediate problem.
NTSB has previously said a joint bar, used to hold two sections of rail together, had been cracked and repaired. The railroad says it was replaced.
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