June 3 (Reuters) - U.S. railroad operator Norfolk

Southern ( NSC ) said Chairman Claude Mongeau resigned from the

company's board on Tuesday, citing personal reasons.

Mongeau had been an independent director on Norfolk's board

since 2019, and was appointed chairman in May last year. He had

previously served as president and chief executive for Canadian

National Railway ( CNI ) from 2010 to 2016.

The board will elect a new chair at its next meeting later

this month, the company said.

Mongeau is currently also a director at Canadian oil and gas

firm Cenovus Energy ( CVE ).

Norfolk had agreed to add an independent member to its board

last year, settling a long-drawn battle with activist investor

Ancora Holdings over the company's governance.