49 C.F.R. § 179.300-4 Insulation.
Title 49 - Transportation
(a) Tanks shall not be insulated. (b) [Reserved]
Title 49: Transportation
PART 179—SPECIFICATIONS FOR TANK CARS
Subpart E—Specifications for Multi-Unit Tank Car Tanks (Classes DOT-106A and 110AW)
§ 179.300-4 Insulation.