The Canadian Transportation Agency would issue the ruling. And if a carrier...and it's not just railway. I'm not aware of a freight railway ever having not complied with an agency order. But if the agency becomes aware that an order has not been complied with, they will table their order through the Federal Court, and then enforcement action to get the industry to comply with the order commences through whatever tools the Federal Court has. Normally when you file an order of the agency in Federal Court, it gets the industry's attention.
On May 5th, 2014. See this statement in context.