CHICAGO--(BUSINESS WIRE)--Fitch Ratings has assigned a rating of 'BBB-' to the $500 million notes to be issued by Kansas City Southern's (KSU) subsidiaries primary U.S. operating entity, Kansas City Southern Railway Co (KCSR). Corporate ratings for KSU and its two primary subsidiaries, KCSR and Kansas City Southern de Mexico (KCSM), are unaffected. The issuance will represent a senior unsecured obligation of KCSR and will be guaranteed by KSU. Like KCSR's existing debt, it will not feature a gu