{"data":{"id":"us/49-cfr-174.300","jurisdiction":"us","citation":"49 CFR 174.300","heading":"Special handling requirements.","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(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(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(1) The lading space is not equipped with any electrical apparatus that is not non-sparking or explosion-proof;\n(2) There is no combustion apparatus in the lading space;\n(3) There is no connection for the return of air from the lading space to any combustion apparatus; and\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(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.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—HAZARDOUS MATERIALS REGULATIONS","PART 174—CARRIAGE BY RAIL","Subpart G—Detailed Requirements for Class 3 (Flammable Liquid) Materials"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"82535226b5fc42656e4c6d0b33a47ea6a1bb6340af07200042a4c4d58ab060c2","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-174.290","next":"us/49-cfr-174.304"},"notice":"GroundRules: Original legal text. Not legal advice."}