The union representing workers at Canada's two main rail companies said on Friday it had filed court challenges against rulings by the country's industrial labor board that forced them back to work, Reuters reported.
On Saturday, the board accepted a request from the government to order more than 9,000 Teamsters members back to work at Canadian National Railway CNR.TO and Canadian Pacific Kansas City and to impose binding arbitration.
The union had already said it would appeal the rulings on the grounds that they were a win for the railways and could lead to the imposition of future contracts, eroding workers' bargaining power.
"These decisions, if left unchallenged, set a dangerous precedent where a single politician can bust a union at will," said Paul Boucher, president of the Teamsters rail union.