Canada's freight rail network could come to a grinding halt this week, inflicting a huge economic toll after the country's two largest railroad operators on Sunday issued lockout notices to the Teamsters union that represents nearly 10,000 workers.

CN, CPKC warn of lockouts starting Aug. 22 unless progress is made
Strike action delayed until CIRB hands down decision on safety implications of work stoppage
CPKC, Teamsters to continue meeting as Canadian Industrial Relations Board deliberates