Because of significant congestion across the country in supply chains and at ports, in part due to the delays of importers in picking up their cargo from inland terminals, CN will be handling some Montreal-destined cargo over Valleyfield, QC. The goal of this decision is to increase the volume of imports that can depart the ports, thereby reducing the time container ships are anchored in Canadian ports. The Canada Border Services Agency (CBSA) is participating in this solution and has established processes to be followed.
See CN Customs Bulletin #67 for more information on the process and for answers to common questions.