Division 1.1, 1.2, or 1.3 (as such terms are defined in section 173.50 of title 49, Code of Federal Regulations). (2) Flammable gas The term flammable gas has the meaning given such term in section 173.115(a) of title 49, Code of Federal Regulations. (3) Flammable liquid The term flammable liquid has the meaning given such term in section 173.120(a) of title 49, Code of Federal Regulations. (4) Hazardous material The term hazardous material means a substance or material designated by the Secretary of Transportation as hazardous pursuant to section 5103 of title 49, United States Code. (5) High-hazard train The term high-hazard train means a single train transporting, throughout the train consist— (A) 20 or more tank cars loaded with a flammable liquid