especially hazardous cargo
(2) Especially hazardous cargo defined .— In this subsection, the term “especially hazardous cargo” means anhydrous ammonia, ammonium nitrate, chlorine, liquefied natural gas, liquefied petroleum gas, and any other substance, material, or group or class of material, in a particular amount and form that the Secretary determines by regulation poses a significant risk of creating a transportation security incident while being transported in maritime commerce.