49 CFR § 176.230
Stowage of Division 2.1 (flammable gas) materials
November 18, 2020
Division 2.1 (flammable gas) materials transported in Specification 106A or 110A multi-unit car tanks must be stowed on deck only, and must be protected from sources of heat.
[78 FR 1095, Jan. 7, 2013]