In the 1914 case of Simon v. Southern Railway Company, the United States Supreme Court ruled in favor of Southern Railway Company. The plaintiff, Simon, had sued for damages after a train accident caused by alleged negligence on part of the railway company resulted in injuries to his person and property. However, he failed to provide sufficient evidence proving that negligence was indeed responsible for his losses. The court held that mere conjecture or speculation was not enough to establish liability; there must be substantial proof showing that negligence directly led to injury or damage suffered by the plaintiff. Therefore, since Simon could not conclusively prove this causal link between Southern Railway's supposed negligence and his own personal harm and property damage, he did not meet necessary legal requirements for receiving compensation from defendant.

In the dissenting opinion for Simon v. Southern Railway Company, it was argued that the majority's decision to uphold a lower court ruling in favor of the railway company contradicted previous Supreme Court rulings on similar cases. The dissenting justices believed that there were significant errors made during trial proceedings, including incorrect jury instructions and an unfair burden placed on Simon to prove negligence by the railway company beyond reasonable doubt. They contended that these procedural mistakes denied Simon his right to a fair trial and should have been grounds for overturning the original verdict. Furthermore, they disagreed with how evidence was interpreted and felt it did support claims of negligence against Southern Railway Company. Thus, they concluded their colleagues' refusal to grant a new trial represented an unjust application of legal principles.