Apparently, Altex can ship bitumen by rail for less than the cost of shipping via pipeline.
Don’t know if numbers make sense for light oil but there is a CN rail line to Hay River.

Even if the Gateway project gets approved, we are probably talking several years before oil flows to the west coast via pipeline. If a number of small producers got together and committed to contracts with CN, maybe they could start supplying Asia in a much shorter time frame and receive higher prices for the product to boot.