If oil doesn't move by pipeline it will move by rail.
So it is absolutely not the case, that "if oil doesn't move by pipeline it will move by rail", since, depending on market conditions, if oil doesn't move by pipeline it will sit in the ground.
Still that seems like a relatively small business interest, relative to the overwhelming behemoth implied by "astroturfing". The presence of some amount of self-interested business funding cannot invalidate the legitimacy of a point of view, or there would be no such thing as a legitimate point of view. So what I look for is a severe power disparity between the two sides which would swamp the smaller side's point of view.
In this situation, that seems like the oil companies and the legible-business-interest preference of state and federal governments. Railroads being on the opposing side doesn't really alter my appraisal of that balance. But I'd be interested in hearing the involvement of a larger entity that I've missed.