Rufus Wheeler Peckham, Northern Pacific Company v. Peterson…
“ The rule is that, in order to form an exception to the general law of nonliability, the person whose neglect caused the injury must be 'one who was clothed with the control and management of a distinct department, and not a mere separate piece of work in one of the branches of service in a department.' This distinction is a plain one, and not subject to any great embarrassment in determining the fact in any particular case. ”
