Demand for rail freight shipping is up, as trucking becomes more expensive. Both use diesel fuel, but trains are more efficient at carrying heavy loads long distances. Scott Olson/Getty Images

Trump speculates on diesel fuel export ban as high prices ripple across US economy

There’s not much diesel fuel lying around, and lots of people want to buy what is available, as well as what little is produced each day. It’s all a matter of supply and demand.

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