President Donald Trump wants to allow natural gas to be shipped in railroad cars, a move that would open new markets hungry for the fuel but could risk catastrophic accidents if one were to derail.

Trump on Wednesday ordered the Transportation Department to write a new rule permitting super-chilled natural gas to be shipped in specialty tank cars. The order follows a multiyear lobbying campaign by railroads and natural gas advocates, who argue it is needed to serve customers in the U.S. Northeast, where there aren’t enough pipelines, and making it possible to use the gas to power ships and trains.

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