The Directive “requires all tank car owners to remove, within 60 days, any 3-inch McKenzie UNNR ball valves in tank cars used to transport any hazardous material described in 49 CFR 172.101.

The agency's March 13 order gives owners 60 days to replace any 3-inch McKenzie UNNR ball valve in a tank car used to transport any hazardous material described in 49 CFR 172.101 and 90 days to ...