A government agency is recommending that all 50 states enact laws requiring bicyclists to wear helmets to stem an increase in bicycle deaths on U.S. roadways.
Federal investigators are trying to figure out why a switch was in the wrong position, sending an Amtrak train into a freight train and killing a conductor and an engineer in South Carolina.
As repair crews work to restore rail service following the deadly Amtrak derailment in Philadelphia, investigators are trying to determine the reason for the train's acceleration and sorting through conflicting reports about an object striking its windshield.
Philadelphia Mayor Michel Nutter says all passengers and crew members have been accounted for two days after the deadly Amtrak crash.
National Transportation Safety Board officials investigating a deadly commuter train crash hope to have answers soon to how fast the train was going, whether its brakes were applied and whether its horn was sounded as it approached a crossing where it slammed into an SUV.