The Teamsters union that represents workers at both of Canada’s largest freight railroads has filed the lawsuits it promised challenging the orders that forced employees back to work.

Canadian railway operations have resumed after a brief work stoppage, following government intervention in an ongoing labor dispute.

Train movements at Canadian National Railway and Canadian Pacific Kansas City are almost back to normal after a short lockout of unionized workers, according to data provider RailState.

TORONTO — The Canadian arbitrator appointed to resolve a railroad labor dispute to protect the North American economy has ordered employees at two major railroads back to work.

A union filed strike notice against Canada’s largest railway on Aug. 23 just hours after trains began rolling again, likely derailing plans to revive vital shipping networks.

Canada’s two largest railways are preparing to restart operations after the country's government stepped in to try to end a labor dispute that has halted freight movement.

TORONTO — CN is ending its lockout immediately and moving forward with a plan to get its trains moving again following an order to enter forced arbitration with its union, a rail official says.

Two mining giants are rerouting shipments and turning to trucks to deal with disruptions from a Canadian railway stoppage that threatens to undermine the industry’s operations.

Importers and exporters are left with few options as a near-total rail shutdown in Canada risks delaying ocean shipments, spiking freight costs and straining the busiest U.S. ports.

The Canadian railway system has been struck with two major work stoppages amid failed labor negotiations Aug. 22.