The US Department of Transportation's Pipeline and Hazardous Materials Safety Administration (PHMSA) has issued an advisory urging freight rail companies to inspect protective coverings over pressure relief valves in the wake of a February 3 train derailment in Ohio. This advisory follows the release of a toxic chemical and ongoing cleanup efforts, as well as concerns from area residents about air and drinking water safety. The PHMSA hopes to ensure that freight rail companies are taking the necessary safety measures to protect the public from any potential risks.