The Pipeline and Hazardous Materials Safety Administration (PHMSA) said late Monday that federal law preempts a state law in Washington that restricts the rail transport of crude oils that exceed a certain vapor pressure limit.
“PHMSA determined that Washington State’s vapor pressure requirement does not conform to U.S. Hazardous Materials Regulations and is an obstacle to accomplishing and carrying out Federal Hazardous Materials Transportation Law,” PHMSA said Monday. The decision is among the...