The Federal Railroad Administration proposed broad new requirements that railroads run trains with two-member crews, saying that the already controversial proposal is justified in light of recent accidents in Canada and the United States.

President Obama announced he will nominate Marie Therese Dominguez to lead the Pipeline and Hazardous Materials Safety Administration, and Sarah Feinberg as head of the Federal Railroad Administration.

Federal Railroad Administration chief Joseph Szabo has announced he will leave his job overseeing the nation’s rail carriers.