Just one thing, focusing on the regulations that were being fought over doesn't matter in this case- the long-standing safety rules (i.e., STOP the train when the Hot Box exceeds a maximum safe temperature, for instance when it's ON FIRE) were MANUALLY OVERRIDDEN by administration. The focus here should be first on the decision-makers, and yes even the order-obeyers, because the derailment wasn't of normal cargo, and they all knew it.