It is too bad that grizzly bears, especially sows get killed by trains. I know a lot of animals meet their demise on the train tracks. Hopefully some type of solution can be figured out to reduce the number of grizzly bear and other animal deaths by train accidents. Perhaps some type of scent sprayed on the tracks would deter animals from coming near. I know dogs hate sour apple smell. Another idea would be to run electrical wire along each side of the tracks through high animal population areas although it would be costly.
This 5 year old grizzly sow was killed by a car in Banff. Unfortunately it was already the second one this year: