Transport Canada: Normalized steel TIH requirement, consistent with U.S.
Railroad tank cars transporting TIH (toxic inhalation hazard) substances in Canada will be required to have heads and shells constructed of normalized steel under updated Transportation of Dangerous Goods Regulations established by Transport Canada. The new rules, which take effect July 2, 2021, are consistent with updated U.S. regulations. Normalized steel undergoes heat treatment that increases its durability and resistance to cracking at low temperatures.