In Thomas v. Railroad Company, the Supreme Court of the United States was asked to decide whether a railroad company was liable for damages caused by a train accident. The plaintiff, Thomas, was a passenger on the train when it collided with another train. He was injured in the accident and sued the railroad company for damages. The Court held that the railroad company was liable for the damages caused by the accident. The Court reasoned that the railroad company had a duty to exercise reasonable care in the operation of its trains and that it had breached this duty by failing to take proper precautions to prevent the accident. The Court also held that the railroad company was liable for the damages caused by the accident, even though the accident was caused by the negligence of the other train's engineer. The Court's decision established that railroad companies are liable for damages caused by their negligence, even if the negligence of another party contributed to the accident. This decision has been cited in numerous cases since then, and it has become an important precedent in the area of railroad liability.

Justice Field delivered the dissenting opinion in Thomas v. Railroad Company, arguing that the majority's decision was contrary to both law and justice. He argued that a contract between two parties should be enforced according to its terms unless there is fraud or mistake involved, which he did not believe were present in this case. Furthermore, he argued that it would be unjust for one party to benefit from another's breach of contract when they had no knowledge of such breach prior to entering into the agreement. In his view, if an individual enters into a contract with full knowledge of all relevant facts then they should not be able to avoid their obligations simply because those facts later change due to circumstances beyond their control. Justice Field concluded by stating that while contracts are subject to modification under certain conditions, these modifications must occur through mutual consent and cannot result from unilateral action on either side without legal justification or excuse.