30 C.F.R. § 57.6203 Locomotives.
Title 30 - Mineral Resources
Explosive material shall not be transported on a locomotive. When explosive material is hauled by trolley locomotive, covered, electrically insulated cars shall be used.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart E—Explosives
Transportation—Surface and Underground
§ 57.6203 Locomotives.

