The report by the National Transportation Safety Board says that although the integrity of the bolts was not the direct cause of the derailment, they contributed to the severity of the incident when a portion of one train car sliced into another, the Courant said.
The NTSB is now recommending that Metro-North replace thousands of bolts on the 400 M-8 train cars that operate on the New Haven Line and the New Canaan Branch, the Courant reported. The 400 cars were purchased by the state of Connecticut for use on the New Haven Line.
Metro-North officials are disputing the findings of the NTSB, the Courant said.
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