"McCallum quickly moved to install a management system to replace the overloaded manager. He broke his railroad into geographical divisions of manageable size. Each was headed by a superintendent responsible for the operations within his division, Each divisional superintendent was required to submit detailed reports to central headquarters, from where McCallum and his aides coordinated and gave general direction to the operations of the separate divisions. Lines of authority between each superintendent and his subordinates and between each superintendent and headquarters were clearly laid out. In sketching these lines of authority on paper, McCallum created what might have been the first organizational chart for an American business."