Democratic U.S. senator raises concerns over potential CP, CSX deal

CHICAGO, Oct 16 (Reuters) - The head of a U.S. Senate subcommittee raised concerns in a letter on Thursday to the U.S. Attorney General and head of the top U.S. rail regulator about a potential merger between Canadian Pacific Railway Ltd and CSX Corp, and called on them both to fully review the antitrust implications of any such deal.