Possible work stoppage at Canada’s two largest railroads could disrupt US supply chain next week

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DETROIT (AP) — Canada’s two largest railroads are starting to shut down their shipping networks as a labor dispute with the Teamsters union threatens to cause lockouts or strikes that would disrupt cross-border trade with the U.S.

Both the Canadian Pacific Kansas City and Canadian National railroads, which haul millions of tons of freight across the border, have stopped taking certain shipments of hazardous materials and refrigerated products.