## Facts

- A traction company operated a trolley line in Dunkirk, New York, using overhead electric wires.
- The trolley line ran beneath a railroad bridge/culvert that pedestrians used as a shortcut and where children played.
- The bridge had a parapet about eighteen inches wide; the trolley wire was strung roughly four feet, seven and three-fourths inches below the top of the parapet.
- A twelve-year-old boy crossed the bridge while swinging an approximately eight-foot wire.
- The boy swung the wire over the side so that it contacted the overhead trolley wire below, causing electrical shock and burns.
- A jury returned a verdict for the boy; the intermediate appellate court affirmed by a divided vote.

## Issues

1. Whether the trolley operator breached its duty of reasonable care by failing to take additional precautions against a child contacting the overhead wire from the bridge.
2. Whether an accident caused by a child swinging a long wire into an otherwise out-of-reach trolley line was a foreseeable risk within the area of ordinary prevision.

## Decision

- The New York Court of Appeals reversed the plaintiff’s judgment and ordered a new trial.
- The court held there was no evidence of negligence because the accident was extraordinary and not fairly within ordinary prevision.
- The court concluded the operator’s lawful use of an overhead trolley system was not negligent in itself and the wire’s placement made ordinary contact from the bridge impossible.

## Legal Principles

- Lawful operation of an overhead electric trolley system is not negligence per se; liability depends on failure to take reasonable precautions.
- Use of electricity requires a high degree of vigilance, but the duty is limited to risks that are reasonably foreseeable.
- Negligence is not established by an extraordinary accident that could not reasonably be anticipated at a particular location.
- Foreseeability is informed by the physical setting, prior similar accidents, and customary practice; absent warning signs of special danger, no special protective measures are required.
- Tort law does not make the operator of a dangerous instrumentality an insurer against all possible harms; the duty does not extend to guarding against limitless, highly unusual conduct.

## Conclusion

The court denied recovery because the trolley wire was positioned so that ordinary users of the bridge could not reach it, and the child’s injury resulted from an unusual and unpredictable act—swinging a long wire into the line—placing the harm outside the range of reasonably foreseeable risks that define negligence.


Adams v. Bullock, 227 N.Y. 208, 125 N.E. 93 (N.Y. 1919)