Fire investigators are labeling the massive fire that destroyed a train bridge Thursday night as "suspicious" and are asking for the public's help in determining whether it was arson. An arson tip line has been set up and Fire Capt. Jim Doucette said the blaze "moved very, very fast," leading investigators to suspect it may have been set. "Until we rule it out I would call it suspicious," Doucette said about noon Friday. Investigators say it is unlikely that a grass fire sparked the blaze because the vegetation in the area is not dry enough for that. The fire that...