In the case of Chicago and Northwestern Railway Company v. Osborne, the U.S Supreme Court ruled in favor of the railway company. The dispute arose when Mr. Osborne was injured while working for the railway company due to a faulty machine that he claimed his employer knew about but failed to fix or replace it. He sued for damages under Nebraska state law which allowed employees to sue their employers if they were injured as a result of negligence on part of their employers. The court held that federal law preempted state laws regarding railroad worker safety, specifically those related to equipment maintenance and inspection standards set by Federal Safety Appliance Act (FSAA). Therefore, any claim made under such circumstances should be governed by federal rather than state laws. This ruling effectively limited workers' ability to sue railroads under more favorable state laws and instead required them to prove violation of specific FSAA regulations in order for their claims against rail companies over workplace injuries caused by defective equipment could succeed.

In the dissenting opinion for Chicago and Northwestern Railway Company v. Osborne, it was argued that the majority's decision to uphold a state law requiring railway companies to provide equal facilities for all passengers regardless of race or color violated the Commerce Clause of the U.S. Constitution. The dissenting justices contended that this regulation interfered with interstate commerce by imposing undue burdens on railroad companies operating across state lines. They further asserted that such matters should be left to Congress rather than individual states, as they involve national interests and require uniformity in regulation which can only be achieved through federal legislation. Additionally, they expressed concern over potential conflicts between different states' laws if each were allowed to regulate railroads independently.