Presumably because cost of derailments is less than amount of profits that would not be made if everything wasn't pushed to its breaking point. I think the poi

Presumably because cost of derailments is less than amount of profits that would not be made if everything wasn't pushed to its breaking point. I think the point of the article is that given the hazardous nature of much of the cargo being transported, there's no room for such gambling here, and yet it's being done routinely.