{"operation":"document","citation":"49 CFR 174.300","title":"Special handling requirements.","source_type":"regulation","agency":"Pipeline and Hazardous Materials Safety Administration","status":"current","official":true,"published_on":null,"effective_on":"2026-08-18","summary":"(a) Class 3 (flammable liquid) materials may not be loaded, transported, or stored in a rail car equipped with any type of lighted heater or open-flame device, or in a rail car equipped with any apparatus or mechanism utilizing an internal combustion engine in its operation.\n\n(b) A truck body or tra","machine_formats":{"json":"https://regulus.evalyn.ai/document/49-cfr-174-300.json","markdown":"https://regulus.evalyn.ai/document/49-cfr-174-300.md"},"app_url":"https://regulus.evalyn.ai/document/49-cfr-174-300","source_url":"https://www.ecfr.gov/on/2026-08-18/title-49/section-174.300","body":"(a) Class 3 (flammable liquid) materials may not be loaded, transported, or stored in a rail car equipped with any type of lighted heater or open-flame device, or in a rail car equipped with any apparatus or mechanism utilizing an internal combustion engine in its operation.\n\n(b) A truck body or trailer which is loaded with a Class 3 (flammable liquid) materials and equipped with a lighted heater or any automatic heating or refrigerating apparatus may not be loaded on a flatcar except as provided in paragraph (c) of this section.\n\n(c) Heating or refrigeration apparatus on a motor vehicle loaded with Class 3 (flammable liquid) materials may be operated while the motor vehicle is loaded on a flatcar only if:\n\n(1) The lading space is not equipped with any electrical apparatus that is not non-sparking or explosion-proof;\n\n(2) There is no combustion apparatus in the lading space;\n\n(3) There is no connection for the return of air from the lading space to any combustion apparatus; and\n\n(4) The heating system conforms to § 393.77 of this title and does not heat any part of the lading over 54 °C (129 °F).\n\n(d) Metal barrels or drums containing Class 3 (flammable liquid) materials may be transported in a steel gondola or flatcar or in a stock car. However, they may not be transported in a hopper bottom car.\n\n[Amdt. 174-26, 41 FR 16092, Apr. 15, 1976, as amended by Amdt. 174-31, 43 FR 31143, July 20, 1978; Amdt. 174-68, 55 FR 52683, Dec. 21, 1990]","truncated":false,"body_characters":1460}