** U.S. railroad company's shares up 3.9 pct at $25.60
** Canadian Pacific Railway Ltd approached CSX about takeover in Jan; CSX rebuffed CP's advance, the WSJ reports (on.wsj.com/1WUL4yJ)
** CP has also been pressing for a takeover bid for Norfolk Southern Corp
** Norfolk Southern has repeatedly rejected CP's offers citing "substantial regulatory risks and uncertainties"
** Up to Tuesday's close, CSX's stock had fallen 5 pct this year, while CP's declined about 7 pct