Key Facts

—The confirmation. Cosan said on June 29 it is evaluating alternatives for its stake in the railway Rumo, including a partial sale.

—The adviser. It hired BTG Pactual to run the process, turning months of rumor into an official mandate.

—The stake. Cosan holds about a fifth of Rumo, the country’s largest independent rail freight operator.

—The motive. The holding is racing to cut an expanded net debt of about 11.5 billion reais ($2.22bn).