Shares of Union Pacific Corp. were down $1.25, or 1.2 percent, to $100.24; CSX Corp. was off 28 cents, or 1.3 percent, at $21.57; Norfolk Southern Corp. was down $1.25, or 1.7 percent, to $72.65; and Canadian National Railway Co. was down 95 cents, or 1.2 percent, to $78.28.