CARDOZO, J.

The defendant runs a trolley line in the city of Dunkirk, employing the overhead wire system. At one point, the road is crossed by a bridge or culvert which carries the tracks of the Nickle Plate and Pennsylvania railroads. Pedestrians often use the bridge as a short cut between streets, and children play on it. On April 21, 1916, the plaintiff, a boy of twelve years, came across the bridge, swinging a wire about eight feet long. In swinging it, he brought it in contact with the defendant's trolley wire, which ran beneath the structure. The side of the bridge was protected by a parapet eighteen inches wide. Four feet seven and three-fourths inches below the top of the parapet, the trolley wire was strung. The plaintiff was shocked and burned when the wires came together. He had a verdict at Trial Term, which has been affirmed at the Appellate Division by a divided court.

We think the verdict cannot stand. The defendant in using an overhead trolley was in the lawful exercise of its franchise. Negligence, therefore, cannot be imputed to it because it used that system and not another ( Dumphy v. Montreal L., H. P. Co., 1907 A.C. 454). There was, of course, a duty to adopt all reasonable precautions to minimize the resulting perils. We think there is no evidence that this duty was ignored. The trolley wire was so placed that no one standing on the bridge or even bending over the parapet could reach it. Only some extraordinary casualty, not fairly within the area of ordinary prevision, could make it a thing of danger. Reasonable care in the use of a destructive agency imports a high degree of vigilance ( Nelson v. Branford L. W. Co., 75 Conn. 548, 551; Braun v. Buffalo Gen. El. Co., 200 N.Y. 484). But no vigilance, however alert, unless fortified by the gift of prophecy, could have predicted the point upon the route where such an accident would occur. It might with equal reason have been expected anywhere else. At any point upon the route, a mischievous or thoughtless boy might touch the wire with a metal pole, or filing another wire across it ( Green v. W.P. Rys. Co., 246 Penn. St. 340). If unable to reach it from the walk, he might stand upon a wagon or climb upon a tree. No special danger at this bridge warned the defendant that there was need of special measures of precaution. No like accident had occurred before. No custom had been disregarded. We think that ordinary caution did not involve forethought of this extraordinary peril. It has been so ruled in like circumstances by courts in other jurisdictions ( Green v. W.P. Rys. Co., supra; Vannatta v. Lancaster L. P. Co., 164 Wis. 344; Parker v. Charlotte Elec. Ry. Co., 169 N.C. 68; Kempf v. S. I.E.R.R. Co., 82 Wn. 263; Sheffield Co. v. Morton, 161 Ala. 153). Nothing to the contrary was held in Braun v. Buffalo Gen. El. Co. ( 200 N.Y. 484) or Wittleder v. Citizens Electric Ill. Co. ( 47 App. Div. 410). In those cases, the accidents were well within the range of prudent foresight ( Braun v. Buffalo Gen. El. Co., supra, at p. 494). That was also the basis of the ruling in Nelson v. Branford Lighting Water Co. ( 75 Conn. 548, 551). There is, we may add, a distinction, not to be ignored, between electric light and trolley wires. The distinction is that the former may be insulated. Chance of harm, though remote, may betoken negligence, if needless. Facility of protection may impose a duty to protect. With trolley wires, the case is different. Insulation is impossible. Guards here and there are of little value. To avert the possibility of this accident and others like it at one point or another on the route, the defendant must have abandoned the overhead system, and put the wires underground. Neither its power nor its duty to make the change is shown. To hold it liable upon the facts exhibited in this record would be to charge it as an insurer.

The judgment should be reversed and a new trial granted, with costs to abide the event.

HISCOCK, Ch. J., CHASE, COLLIN, HOGAN, CRANE and ANDREWS, JJ., concur.

Judgments reversed, etc.