The National Transportation Safety Board will be holding its investigative hearing into the East Palestine train derailment on June 22 and 23, according to NTSB public affairs officer Keith Holloway.

According to the NTSB website, investigative hearings involve:

  • the initial notification and decided to investigate;
  • on-site fact gathering;
  • analysis of facts and determination of probable cause;
  • acceptance of a final report; and
  • advocating for the acceptance of safety recommendations arising from the investigation.

The NTSB state that the process is not strictly linear, and phases will overlap. The NTSB website says to complete an investigation usually takes 12 to 24 months, but factors can vary and could change the time estimate.