The history of playground fights and corporate takeovers shows that winners don’t have to play nice.

Add another chapter to that book with the announcement Wednesday that two activist hedge funds, represented by Schulte Roth & Zabel and Kirkland & Ellis, succeeded in getting four of their five nominees elected to CSX Corp.’s 12-person board. (The vote was held at the company’s June 25 annual meeting, but the preliminary results were not announced until Wednesday.)