Pacific Railroad of Missouri v. Ketchum was a United States Supreme Court case that dealt with the issue of whether a railroad company was liable for damages caused by a fire that was started by sparks from the company's locomotive. The plaintiff, Ketchum, was a farmer who owned land adjacent to the railroad tracks. He sued the railroad company for damages caused by a fire that was started by sparks from the company's locomotive. The Supreme Court held that the railroad company was liable for the damages caused by the fire. The Court reasoned that the company had a duty to use reasonable care to prevent sparks from its locomotive from setting fire to adjacent land. The Court noted that the company had failed to take reasonable precautions to prevent the fire, such as providing spark arresters on the locomotive or having the locomotive travel at a slower speed. The Court concluded that the company was liable for the damages caused by the fire. In conclusion, the Supreme Court held that the railroad company was liable for the damages caused by the fire that was started by sparks from its locomotive. The Court reasoned that the company had a duty to use reasonable care to prevent sparks from its locomotive from setting fire to adjacent land, and that it had failed to take reasonable precautions to prevent the fire.

In Pacific Railroad of Missouri v. Ketchum, the Supreme Court was tasked with deciding whether a railroad company could be held liable for damages caused by its negligence in failing to provide adequate safety measures on its trains. The majority opinion found that the railroad had no duty to protect passengers from injury and thus could not be held liable for any resulting harm. However, Justice Field dissented from this ruling, arguing that it was unjust and contrary to public policy for railroads to escape liability when they failed in their duty of care towards passengers. He argued that since railroads were common carriers who accepted payment in exchange for transporting people safely, they should have been required to take reasonable steps necessary for passenger protection and should have been responsible if those steps were neglected or insufficiently provided.