One very simple example is it's cheaper to send crude or bitumen through a pipeline than it is by rail. If in fact you do construct pipelines, that would mean there's more money flowing back to the producers, which would by implication suggest that they would then be able to reinvest more money into more drilling, more emissions systems, and innovation and technology.
The other point is I think rail is a system that's being used right now as a bridge to getting these pipelines built. On a long-term basis rail should probably be reserved for other commodities, not necessarily crude.