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<blockquote data-quote="Box Ox" data-source="post: 5522853" data-attributes="member: 48469">So my guess is that the hot bearing detector 20 miles from East Palestine is the one at milepost 69.01, where the temperature reading was 103 degrees above ambient. Hot bearing detectors don&#039;t trigger an alarm until they read 170 degrees or higher. 170 being the threshold for a &quot;non-critical&quot; alarm telling operators to stop and inspect, and higher than 200 degrees being the threshold for a &quot;critical&quot; alarm to &quot;set out railcar.&quot;So within that final 20 mile stretch between hot bearing detectors the bearing went from 103 degrees above ambient, which didn&#039;t trigger any alarms, to 253 degrees above ambient, which triggered the critical alarm when they crossed that last hot bearing detector and had the crew hit the brakes.The NTSB or whoever probably will look at the glow in that footage near the second to last hot bearing detector at milepost 69.01 and also wonder why the hot bearing detector was only reading 103 degrees at that time. Maybe they&#039;ll change something up with how/what the system registers in the future.</blockquote>

[QUOTE="Box Ox, post: 5522853, member: 48469"] So my guess is that the hot bearing detector 20 miles from East Palestine is the one at milepost 69.01, where the temperature reading was 103 degrees above ambient. Hot bearing detectors don't trigger an alarm until they read 170 degrees or higher. 170 being the threshold for a "non-critical" alarm telling operators to stop and inspect, and higher than 200 degrees being the threshold for a "critical" alarm to "set out railcar." So within that final 20 mile stretch between hot bearing detectors the bearing went from 103 degrees above ambient, which didn't trigger any alarms, to 253 degrees above ambient, which triggered the critical alarm when they crossed that last hot bearing detector and had the crew hit the brakes. The NTSB or whoever probably will look at the glow in that footage near the second to last hot bearing detector at milepost 69.01 and also wonder why the hot bearing detector was only reading 103 degrees at that time. Maybe they'll change something up with how/what the system registers in the future. [/QUOTE]

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