The hotbox detector could have seen the bearing overheating and been ignored, or have malfunctioned or just not been sensitive enough to detect the problem when

The hotbox detector could have seen the bearing overheating and been ignored, or have malfunctioned or just not been sensitive enough to detect the problem when the train passed. It’s old tech that should have caught this in most cases. The even older tech solution would be adding a caboose on trains carrying hazardous materials. Maybe you don’t need a caboose today but someone watching cameras in a cube could do the same thing. ECP does not seem like a solution, and addressing how hazardous chemicals are moved is something that needs to be done.