A consortium of private equity investors is considering a possible takeover bid for Kansas City Southern, the Wall Street Journal reported July 28. The newspaper reported that the Blackstone Group Inc. and Global Infrastructure Partners are exploring a potential buyout that could be worth more than $21 billion. The firms together are exploring a potential deal and speaking to banks, including Citigroup Inc., about financing, people familiar with the matter told the newspaper. The deal provides a bet on the increase in U.S.-Mexico trade, given that KCS' rail network operates in both countries, the paper reported.