CHICAGO--(BUSINESS WIRE)--Fitch Ratings has affirmed the ratings for Kansas City Southern (KCS) and its primary operating subsidiaries, Kansas City Southern Railway Co. (KCSR), and Kansas City Southern de Mexico S.A. de C.V. (KCSM) at 'BBB-'. The Rating Outlook is Positive. The short-term ratings for KCSR and KCSM have been affirmed at 'F3'. A full list of ratings follows at the end of this release. KCS's investment grade rating is supported by the company's solid operating margins, moderate le


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