William O. Douglas,
Francis v. Southern Pacific Company…
“ This Court has itself recognized and acted on the fact that it is the law of Utah that 'when a common carrier accepts a person as a passenger, he is not permitted to deny that he owes to him the duty of diligence, prudence, and skill which, as carrying on a public employment, he owes to all his passengers, and that he cannot escape liability for a negligent performance of that duty, resulting in injury, by urging that the pass or commission was issued, or the gratuitous carriage permitted by him, in violation of law.' Southern Pac. ”
