I always felt that this song was more myth, feelings...you put your own meaning to the words because they are a bit vague and have double meanings..."can't raise a Cain back up" (the family name, Cain...the dead brother..."raise Cain"....wheat in the fields knocked down...Dixie knocked down...) (then then whole image of "train") Who was it, Sandburg?, said don't try to put too much meaning to words.