The enforcement of a rigid system of discipline in the government of works of great magnitude is indispensable to success. All subordinates should be accountable to and be directed by their immediate superiors only; as obedience cannot be enforced where the foreman in immediate charge is interfered with by a superior officer giving orders directly to his subordinates.

p. 40. Partly cited in: Chandler (1977, p. 102) - Report of the Superintendent of the New York and Erie Railroad to the Stockholders (1856)