In the 1974 case of Kelley v. Southern Pacific Co., the United States Supreme Court addressed an issue related to railroad safety and employee rights. The plaintiff, Kelley, was a brakeman for Southern Pacific Company who lost his foot in a work-related accident involving moving train cars on "retarder tracks." He claimed that his injury resulted from unsafe working conditions due to inadequate training and faulty equipment provided by the company. However, the court ruled against him based on two primary reasons: first, there was no federal law requiring specific safety measures or procedures for retarder tracks; secondly, under common law principles of negligence (which were applicable since there were no relevant federal regulations), it could not be proven that Southern Pacific had failed in its duty of care towards its employees as they had provided sufficient training and functional equipment. Thus, while acknowledging potential dangers inherent in railway work environments - particularly with regard to retarder track operations - this ruling underscored employers' responsibilities within existing legal frameworks rather than expanding them.

In the dissenting opinion for Kelley v. Southern Pacific Co., Justice Douglas argued that the majority's decision was a departure from established principles of tort law and an unwarranted intrusion into state law by federal courts. He contended that California had a legitimate interest in protecting its citizens from dangerous conditions on property, regardless of whether those dangers were created by natural or artificial conditions. Furthermore, he disagreed with the majority's assertion that railroads should be exempt from this responsibility simply because they are engaged in interstate commerce. He also criticized the majority for ignoring relevant precedent and failing to adequately consider the implications of their ruling on public safety and welfare.