Recently, both countries have issued new rules. According to this Reuters article, the Canadian measures are more stringent. See: Canada’s rail safety measures: earlier and tougher than U.S.

Canada quietly issued new details on rail safety regulation last week that included specifications for the next generation of tank cars that are tougher than some of the options proposed by the U.S. Department of Transportation on Wednesday.

The safety proposals by Transport Canada for hauling dangerous goods, released online on Friday, builds on measures first announced in April that will require older DOT-111 rail cars used for carrying crude oil be phased out by May 2017.

The measures are a response to a massive surge in crude-by-rail shipments in recent years and a string of high-profile disasters involving older tank cars prone to punctures, including one that killed 47 people in Quebec, Canada.

A direct link to the proposed new  U.S. regulations is here.