Goodwell

National Transportation Safety Board

Federal officials say a train driver's failing eyesight was the probable cause of a fiery train crash that killed three people in the Oklahoma Panhandle last year.

Dr. Mary Pat McKay told the National Transportation Safety Board that the driver’s eyesight fluctuated from day to day and he couldn’t always distinguish red, green and yellow lights.

“This was a very bright, sunny clear day,” McKay says. “He may have had difficulty telling which of the lights were illuminated.”