WASHINGTON, Sept. 30 (UPI) -- The fatal crash of an emergency medical helicopter in Maryland Saturday shows the need for safety improvements in such flights, U.S. officials say.

CHICAGO, Dec. 3 (UPI) -- Federal investigators are examining why an engineer didn't slow a speeding passenger train that hit parked freight cars in Chicago.

CHICAGO, Dec. 1 (UPI) -- The federal investigation of a collision in Chicago between an Amtrak passenger train and a Norfolk Southern freight began Saturday.