A man suffered life-threatening injuries after being hit by a train Thursday morning in the Railroad Springs area of Flagstaff. Police say the incident happened near Adirondack Avenue. Officials say the person was walking his dog on the tracks when the train struck the man. Authorities say it appears the dog fled into the woods after the accident. The dog is a German Shepard mix and is the man’s service dog named Barrett. The dog has been found in good condition and has been returned to his family. The incident is under investigation.