In Pacific Railroad Company v. Maguire, the Supreme Court of the United States was asked to decide whether a railroad company could be held liable for damages caused by a fire that was started by sparks from its locomotive. The plaintiff, Maguire, owned a farm near the railroad tracks and claimed that sparks from the locomotive had set fire to his property, causing him to suffer damages. The Court held that the railroad company was liable for the damages caused by the fire. The Court reasoned that the railroad company had a duty to exercise reasonable care to prevent sparks from its locomotive from setting fire to the plaintiff's property. The Court noted that the railroad company had failed to take reasonable precautions to prevent the fire, such as providing a spark arrester on the locomotive, and thus was liable for the damages caused by the fire. The Court also held that the railroad company was not liable for damages caused by the smoke from the locomotive, as the smoke was not the direct cause of the damages. The Court noted that the smoke was a natural consequence of the operation of the locomotive and that the railroad company had taken reasonable precautions to prevent the smoke from causing damage.

In Pacific Railroad Company v. Maguire, the Supreme Court was tasked with determining whether a railroad company could be held liable for damages caused by an employee's negligence in failing to properly secure a train car that derailed and injured another person. The majority opinion found that the railroad company was not liable because it had no knowledge of or control over its employees' actions at the time of the accident. However, Justice Field dissented from this decision, arguing that employers should be held responsible for their employees’ negligent acts if they are committed within the scope of employment and there is evidence showing employer liability under common law principles such as respondeat superior (vicarious liability). He argued further that since railroads were heavily regulated by Congress, they should have been aware of their responsibility to ensure safety on their premises and thus should bear some degree of fault when accidents occur due to employee negligence.