In the case of Smith v. St. Louis and Southwestern Railway Company, 1900, the U.S Supreme Court dealt with a dispute over land ownership between a private individual and a railway company. The plaintiff, Smith, claimed that he had purchased certain lands in Texas from their original owners before they were sold to the railway company by Congress under an Act intended to encourage railroad construction across public lands in Western states. However, it was found that at the time of his purchase from these original owners, they did not have any legal title or claim on those lands as per federal law because these territories were still considered public domain under control of Congress until officially transferred via patent deeds or other formal processes. Therefore, when Congress later granted these same lands to the defendant railway company for its use without knowledge of Smith's prior transaction with previous occupants who held no valid title themselves - this grant was deemed lawful and binding by court due to supremacy clause principles which give precedence to federal laws over state ones where conflicts arise between them regarding matters like property rights on federally owned territories etc., thus ruling against plaintiff's claims here ultimately.

The dissenting opinion in the case of Smith v. St. Louis and Southwestern Railway Company argued that the majority's decision was inconsistent with previous rulings regarding employers' liability for injuries sustained by their employees while on duty. The dissent emphasized that, according to established legal principles, an employer is not responsible for risks inherently associated with a job unless they have failed to provide reasonably safe conditions or equipment. In this particular case, the employee was injured due to his own negligence rather than any fault on part of his employer; he chose to ride on a moving train car despite knowing it could be dangerous and having safer alternatives available. Therefore, the railway company should not be held liable for damages resulting from actions taken at the employee's own discretion and risk.