They need to get grain their grain processed enough at the farm to make it much more durable. An awful lot of research is being done in this area.
Truthfully, a way around the problem might be for government to ease off its ethanol production restrictions, which are the flip side of ethanol fuel production.
That is, an ethanol plant is a weird thing, with government inspection stickers all over the place, adding a huge amount of cost to making alcohol. And there are those stickers all over the alcohol pipeline until it meets the perimeter fence of the plant. On the other side of the fence, nothing. It is just fuel ethanol in a pipe.
So if the feds allowed ethanol production as long as it conformed to state health and safety rules, these surplus crops would vanish. That is, instead of needing a railroad to transport the crop, the farmer could do it himself in a truck.
A North Dakota whiskey distillery could be cleaning up right now.
A lot of famers already do that. Normally we have a glut of meat, this year being one of the few exceptions. Less grain is being processed at the farm.
A year or so ago The Successful Farmer, obviously a trade magazine, did a special edition on the huge meat surplus and our reliance on exports to help alleviate the burden it causes.