Prime Minister Justin Trudeau defended Wednesday his government鈥檚 move to call for binding arbitration and force an end to a work stoppage at the country鈥檚 two major railways, as some union leaders accused the government of taking away their bargaining rights.

In a 15-minute speech to a meeting of the International Union of Operating Engineers, Trudeau touted his governments track record on labour laws and said the call for binding arbitration at Canadian National Railway and Canadian Pacific Kansas City was made out of necessity and 鈥渞eluctantly.鈥�

鈥淯nfortunately, CN and CPKC took the deeply unhelpful decision last Thursday to lock out employees after talks reached an impasse,鈥� Trudeau said.

鈥淭hat came with a cost of over a billion dollars of shipments per day 鈥� and it raised serious public safety concerns, with everything from propane for remote hospitals to chlorine for safe drinking water being transported on our rails.鈥�

CPKC workers went on strike at the same time the lockout took effect. On Saturday, the Canada Industrial Relations Board approved the government鈥檚 request and ordered binding arbitration and an end to the work stoppage.

The Teamsters Canada Rail Conference, which represents 9,300 railway workers, has blasted the government鈥檚 move, saying it takes away bargaining rights from workers.

The heads of the longshore workers unions from Montreal, Vancouver and Halifax also criticized the move.

鈥淭he decision sets a dangerous precedent for future labour disputes and sends a signal to Canadian companies that when negotiations get tough, the federal government will always come to their rescue to help them trample on their employees鈥� rights,鈥� the unions said in a joint press release Wednesday.

Trudeau鈥檚 talk came in the lead-up to a Sept. 16 byelection in the Elmwood-Transcona riding in Winnipeg鈥檚 east end. The riding has a history of strong labour ties, and has been a NDP stronghold since its creation 35 years ago, save for one term in 2011 when the riding voted Conservative.

In his speech, Trudeau pointed to changes his government has implemented since coming to power in 2015, such as a law to ban replacement workers during labour disputes, which was applauded by the audience.

鈥� With files from Christopher Reynolds in Montreal