BUZZ-Norfolk Southern Corp: Canadian Pacific offers to buy
** Railroad operator's shares up 5.8 pct at $92 in trading after the bell
** Canadian Pacific Railway Ltd said it has offered to buy company to create a transcontinental railroad
** Canadian Pacific did not specify a deal value
** Proposal includes a "sizable premium in cash and stock" to Norfolk shareholders, Canadian Pacific said
** Up to Tuesday's close, Norfolk stock had fallen 20.7 pct this year
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