DERAILED: The Obama administration has delayed by nearly a year a plan to boost safety standards for the type of rail car involved in a fiery explosion that killed at least 47 people in Canada this month.

BAD DESIGN: The proposal is intended to fix a dangerous design flaw in rail cars used to haul oil and other hazardous liquids. They tend to split open in major accidents.

WHAT'S THE HOLDUP? The pipeline safety agency said the delay was needed to allow "additional coordination" among officials and interested groups, including industry representatives who have resisted calls to retrofit the cars.