TORONTO — Canadian Pacific Railway Ltd. said Thursday it has received strike notice from the union representing its engineers, conductors and other train employees. The move is the latest escalation in a labour dispute at the Calgary-based railway that could result in a potential nation-wide work stoppage as early as 1 a.m. EST on Sunday. CP Rail indicated Wednesday night that it had issued a 72-hour notice to the Teamsters Canada Rail Conference of its plan to lock out almost 3,000 employees on Sunday, if the union and the company are unable to come to a negotiated settlement or agree to binding arbitration. The two sides are at odds over 26 outstanding issues, including wages, benefits and pensions. But Canadian business organizations are calling on Ottawa to prevent a potential work stoppage at Canadian Pacific Railway Ltd., which could further hamper companies recovering from COVID-19 restrictions and supply chain problems.