This is in Banff National Park. This is the first I've ever heard of trains being a leading cause of death to grizzly bears
http://www.cbc.ca/thenational/indepthanalysis/story/2011/09/28/national-grizzlydeaths.html
http://www.cbc.ca/thenational/indepthanalysis/story/2011/09/28/national-grizzlydeaths.html