Well I'm not sure about the corrosion story. Crude is not corrosive so unless it got corroded from previous produced stuff that cars hauled, crude would not have aggravated the corrosion.
Yeah, there may have been some solvents or other chemicals in the crude because the crude could have come a fracking operation. But I think this would be a pretty small percentage.
The news reports have been posted recently.
http://www.motherjones.com/blue-marble/2013/08/oil-explosion-train-bakken-alberta