C can stand for Chessie, S for Seaboard, and X, which actually has no meaning. However, an August 9, 2016, article on the Railway Age website stated that ... the 'X' was for 'Consolidated' .
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Chessie System was incorporated in Virginia on February 26, 1973, and it acquired the railroads on June 15. On November 1, 1980, Chessie System merged with Seaboard Coast Line Industries to form CSX Corporation.