The Department of Transportation’s Pipeline and Hazardous Materials Safety Administration (PHMSA) is suspending a Trump administration final rule that authorized transporting liquefied natural gas (LNG) by rail car, according to a notice published in the Federal Register.

PHMSA announced a Notice of Proposed Rulemaking to suspend amendments to its Hazardous Materials Regulations finalized last year, which authorized moving LNG by rail. The agency said it wants to put any plans to move the super-chilled fuel by rail car on hold as it “conducts a thorough evaluation” of its regulations in a separate rulemaking.

In the summer of 2020, PHMSA finalized the rule, along with the Federal Railroad Administration, to allow the bulk transport of LNG in specialized rail tank cars....