(AP) — Norfolk Southern Corp. reported its profit was little changed in the fourth quarter from a year ago because the railroad's coal revenue fell 15 percent on weak demand from utilities and export markets. Analysts surveyed by FactSet expected the railroad to report earnings per share of $1.63 on revenue of $2.94 billion. The average estimate of analysts surveyed by Zacks Investment Research was for earnings of $1.64 per share on revenue of $2.93 billion.