Canadian Rail and another railway operator stopped work on Thursday.Andrew Chin/Getty ImagesCanada's rail freight has halted as two major rail companies locked out 10,000 union members.The stoppage follows failed contract negotiations, with workers demanding better wages and conditions.The disruption could cost Canada $251 million daily and impact US industries.Canada's rail freight came to a halt early Thursday after Canadian National and Canadian Pacific Kansas City locked out nearly 10,000 union members.The unprecedented stoppage by Canada's two main rail freight operators could disrupt supply chains in the US and cost Canada 341.5 million Canadian dollars, or $251 million, a day, per Moody's.The stoppage came after months of contract negotiations failed to result in a deal.