The Teamsters Canada Rail Conference union representing workers at CN and CPKC said has filed court challenges against rulings by the Canadian Industrial Relations Board, which forced them back to work.

Teamsters say decision sets dangerous precedent, will challenge the move in federal court if needed
Federal agriculture minister says he’s 'monitoring' the situation
A work stoppage would cost fertilizer sector $55-63 million in lost sales a day, Fertilizer Canada estimates