You can quote all of the rules and what not you want, but, don't blame the train crew. They didn't know it was in the train (a very common occurrence).
What the railroad commissioner said was..."Somehow a doublestack car got on that train" and the UP spokesman said..."The car that was interchanged with us somewhere in Chicago was put on a route that it shouldn't have been on".
Interestingly, it appears that only one individual girder on this bridge was damaged.
I hope someone posts the follow up story that is scheduled for later tonight.