Comments by "AMAR REDER" (@amarreder6241) on "Mark Levin: How Biden is a one-man wrecking ball" video.
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Three such sensors, also called hot-box detectors, were located along 30 miles of track near East Palestine. They recorded increasing temperatures in the suspect wheel bearing, investigators said.
The first detector recorded a temperature of 38 degrees Fahrenheit above the ambient temperature, the report said.
By the time the train reached the second detector 11 miles later, the bearing had reached 103 degrees above the ambient temperature.The third and final detector, located 19 miles later just east of East Palestine, recorded such a high temperature — 253 degrees Fahrenheit above ambient temperature — that the train's crew was alerted to stop the train and inspect the bearing in accordance with Norfolk Southern safety guidelines, the NTSB report said.
Only the third reading was high enough to trigger an alarm, according to the report.
On hearing the alarm, the engineer "responded immediately" to begin bringing the train to a stop, Homendy said, but as the train decelerated, the wheel bearing failed.
Norfolk Southern safety guidelines do not require train operators to take action until wheel bearings reach 170 degrees Fahrenheit above ambient temperature, the report said. Once a critical level of 200 degrees Fahrenheit is reached, Norfolk Southern requires its train operators to stop a train immediately and remove the affected car from the train.
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