 Shares of Union Pacific Corp. UNP, -0.78 dropped 5.0 toward a near two-year low in premarket trading Thursday, after the railroad operator reported third-quarter profit and revenue that beat expectations, due to increased pricing and fuel surcharges, but cut its outlook for carload growth and stock repurchases. Net income rose to 1.90 billion, or 3.05 a share, from 1.67 billion, or 1.07 a share, in the year-ago period. 