This rule amends the Department's Hazardous Materials Regulations to allow the continued use in intrastate service of certain cargo tanks for the carriage of anhydrous ammonia in States where this practice was permitted until the Hazardous Materials...

The Materials Transportation Bureau proposes to amend Part 173 of  Title 49 CFR to authorize the use of nonspecification cargo tanks, and of specification cargo tanks with a design pressure of 250 psig, for the transport of anhydrous ammonia m...