This is the vexxing problem of our time. It is not news unless it affects people, and the response is proportionate to the number of people affected. This could have just as easily been in Toronto, Montreal or Chicago.
I gather though that it is oil originating from Alberta oil sands, which is not nearly as flammable as the Bakken oil which has not been processed to remove volatiles.
BTW, that TSB flicker site is an interesting cross section of incidents. Trains, planes and boats...