The Amtrak chief executive abruptly resigned from the rail service.

Stephen J. Gardner, Amtrak’s chief executive, announced on Wednesday that he would be stepping down from the passenger rail service about three years into the job. In a statement, Mr.…

The Amtrak chief executive abruptly resigned from the rail service.

Stephen J. Gardner, Amtrak’s chief executive, announced on Wednesday that he would be stepping down from the passenger rail service about three years into the job. In a statement, Mr.…