BUZZ-CSX Corp: Shares up on reports of offer from Canadian Pacific
** Railroad's shares up 8.6 pct at $32.50 premarket
** Gets merger offer from Canadian Pacific Railway Ltd , the Wall Street Journal reports on Sunday
** Offer made past week and was rebuffed, newspaper says. It added it was unclear if CP had shelved the plan
** CP and CSX decline to comment on what they call market rumors
** To Friday, CSX shares had gained about 16 pct in the past year, compared with a 12 pct rise in the S&P 500 index
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