NTSB investigators have identified and examined the rail car that initiated the derailment. Surveillance video from a residence showed what appears to be a wheel bearing in the final stage of overheat failure moments before the derailment.
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When the train derailed two weeks ago, it sent things like butyl acrylate into the Ohio River. The chemical has a fruity smell and inhaling it can cause headaches, dizziness, nausea and vomiting.
The investigators' symptoms included sore throats, headaches, coughing and nausea – consistent with what some residents experienced after the February 3 train derailment that released a cocktail of hazardous chemicals into the air, water and soil.
Between 170°F and 200°F, warm bearing (non-critical); stop and inspect. A difference between bearings on the same axle greater than or equal to 115°F (noncritical); stop and inspect. Greater than 200°F (critical); set out railcar.