Canadian freight railroads shut down, dealing a potential blow to North America’s economy CNNUnion dispute shuts down Canadian freight rail amid fears for US trade | Canada The GuardianCanada rail shutdown threatens US supply chains BBC.comCanada’s Railroads Lock Out 9,000 Employees as Labor Talks Break Down The Wall Street JournalLabor Dispute Halts Rail Freight in Canada, Raising Supply Chain Concerns The New York Times