Canadian union threatens to strike against freight railroad hours after trains resume service

TORONTO (AP) — A workers union on Friday threatened a strike at one of Canada’s two major freight railroads, only hours after the company’s trains restarted following a potentially devastating stoppage. Trains were expected to keep moving at least through Monday morning.

Canadian National and Canadian Pacific Kansas City Ltd. locked out their workers on Thursday when negotiations over a new labor contract broke down. That resulted in a near total shutdown of freight rail in the country for more than a day...