CN Rail told the BBC that operations were temporarily suspended in the affected area in the province of Ontario.
Related stories
At Trump meeting, Xi Jinping lays out terms to avoid US-China military conflict
Live: Iran's President says US ‘must choose’ whether to end war
Trump-Xi summit: Four key takeaways from the Washington, DC, meeting
From Nagaland to a path to the Oscars: Indian film brings a rarely seen world to global cinema
Saudi reports fresh Houthi attacks as France pledges to defend key oil port
Costa Rica minister fired for unapproved meeting with Trump in US