A combination of human error and a lack of adequate safety protocols contributed to a fatal Amtrak train crash near Columbia, South Carolina, in February 2018, National Transportation Safety Board officials ruled on Tuesday.

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Safety officials determined that CSX failed to implement adequate safety checks during track upgrades and that a CSX conductor had failed to properly realign a switch before the crash. Amtrak’s failure to conduct a risk assessment on train operations during track work also contributed to the accident, the NTSB said.

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