NEW YORK (Standard&Poor's) Aug. 25, 2010--Standard&Poor's Ratings Services said today that it has affirmed its 'BBB+' issue-level rating on Norfolk, Virginia-based Norfolk Southern Corp.'s (Norfolk Southern) issuance of $250 million in 6% senior unsecured notes due March 15, 2105. These notes are an add-on to the company's previously issued $300 million 6% senior unsecured notes due March 15, 2105. Proceeds from the $250 million senior note offering will be used to fund general corporate purposes, including the redemption and refinancing of outstanding indebtedness, as well as fund working capital and other operational needs. The notes are senior unsecured obligations of Norfolk Southern, ranking equally with the previously issued notes, and with all other unsecured and unsubordinated