That's almost impossible to quantify, but currently there are many issues with container delivery or lack of delivery to be more precise. As Greg pointed out, the problem with the supply chain in Canada with rail is that the railway dictates when they deliver and when they pick up. Essentially they are dictating what businesses can do as far growing, delivering their product and selling it around the world is concerned.
Section 5 of the Canada Transportation Act says that we should have an efficient and effective transportation system for all, not just for the railways. The railways practice precision-scheduled railroading, which is essentially a business model that maximizes their use of their assets, reduces their costs and has no consideration whatsoever for its customers.