A lockout of dockworker foremen at the Port of Vancouver is just one of a series of chokepoints creating logistical problems for ports, railways and shipping companies in North America, says supply chain and logistics firm ITS Logistics. The prospect of tariffs from a Donald Trump administration could add to the logistical problems as exporters from countries facing tariffs try to get goods shipped to the U.S. before they are imposed. …In Montreal, meanwhile, the Maritime Employers Association locked out 1,200 longshore workers on Sunday night after workers rejected what the employers called a final contract offer. A temporary agreement between terminal operators and union officials on the U.S. East and Gulf Coast recently reopened ports there. Meanwhile, diversions by shippers to avoid the Red Sea – which has become too dangerous for many operators — have created complexities and delays for cargo.