— The town of San Buenaventura is a municipal corporation. The legal title to the lands comprising Front Street in said town was granted to the then town authorities October 13,1869, “as a public street, to be forever kept open and maintained as such, and not to be used for any other purpose, nor be diminished in width.” On the 4th of October, 1886, the president and board of trustees of the town, by ordinance, granted to the defendant a right to lay, maintain, and operate a single or double track railroad along and upon said Front Street for the whole length thereof, from a point near Kalorama Street, etc. The plaintiff owned two lots fronting on the north side of said street, one situate in block 19, and one in block 20, the two being separated by a distance of 260 feet. The railroad was constructed along said Front Street prior to September 13, 1888, and on that day plaintiff commenced an action against defendant for damages to his lot situate in block 19, by reason of a cut *419 and fill made in the construction thereof, and on the twenty-sixth day of January, 1889, the amount of plaintiff’s damages were agreed upon and settled between the parties, and paid by defendant to plaintiff, and thereafter, in pursuance of the agreement between the parties, judgment was entered in the cause in favor of defendant. Afterwards the defendant put in a switch on the south side of the street, opposite said block 19, and thereupon the plaintiff brought this action, alleging in the first count of his complaint damages by reason of the construction and maintenance of said railroad in front of his lot in block 20, and in the second count, damages to his said lot in block 19, accrued since the former settlement and judgment, by reason of the continuance of said railroad, and the operation thereof, and of the construction of said switch in front of his said lot in block 19.

The defendant denied all the allegations of the complaint other than those of incorporation, pleaded ils license from the municipal authorities, and, as a separate defense to the second cause of action, pleaded the former settlement, payment, and judgment in bar. At the trial, after the jury was impaneled, but before the introduction of any evidence, defendant moved the court for leave to amend its answer, by pleading the former settlement and judgment as a bar to all the causes of action set out in the complaint. To this the plaintiff objected, on the ground that the amendment did not constitute a defense. After argument, the court overruled the objection, and the amendment was made, the court not imposing terms, to which plaintiff excepted, but plaintiff asked no continuance on account of such amendment. Plaintiff then introduced some evidence tending to show damage to his lot in block 20 by reason of the construction of said railroad, a cut of eighteen inches in depth having been made in the street by reason thereof. Defendant then introduced the judgment roll in the former case, which was admitted without *420 objection, and it was admitted by the parties that the parties to that action were the same as to this; that the railroad mentioned in the former complaint was one and the same railroad as that mentioned in this case; that plaintiff at the time owned the same lots as now, and was then the owner of the sam§ cause of action upon which he now claimed under his first count of the present complaint; and that the said two lots were separated by a distance of 260 feet. Plaintiff then proposed to introduce further evidence as to his damage to the lot situate in block 20, — the cause of action mentioned in the first count of his complaint, — but the court ruled the same out, on the ground that his claim for such damages was barred by the said former judgment. Plaintiff admitted that he had no claim for damage to his lot in block 19, caused by the construction of the railroad’s main track.

The record fails to show the introduction or offer of any evidence of damage by reason of the construction and maintenance of the switch. The plaintiff asked the court to instruct the jury that the former settlement and judgment were not a bar to any claim for damages done to the lot in block 20; that such damages, if any, constituted a separate cause of action from that sued for in the former case, and if any such were found, the same should be included in a verdict for plaintiff. The court refused to so instruct the jury, and, on the contrary, instructed the jury that, as the case was presented, the only question for their consideration was the damages, if any, done to the lot in block 19 by reason of the construction and operation of the switch and side-track in front of his premises in that block. To all these rulings the plaintiff excepted.

We think there was no error in the rulings or instructions of the court in this behalf, so far as relates to any damage accruing to either of plaintiff’s lots prior to and up to the time of filing his complaint or making his *421 settlement in the former action. The elements of his damage up to that time may have been multifarious, but the cause of it was a unit, — the construction and operation of a single railroad, which was comjdete at the time. The fact that it damaged two lots belonging to the same man, at the same time and by the same means, no more created two causes of action than if two horses belonging to the same man had been killed by a single collision with a locomotive, and this has been held to constitute but a single cause of action. (Brannenburg v. Railroad Co., 13 Ind. 103 ; 74 Am. Dec. 250 .) In cases of tort, the question as to the number of causes of action which the same person may have turns upon the number of the torts, not upon the number of different pieces of property which may have been injured. Each separate tort gives a separate cause of action, and but a single one. (1 Sutherland on Damages, 183, and cases cited.) Whenever by one act a permanent in jury is done, the damages are assessed once for all. (3 Sutherland on Damages, 372.) This principle is established in Marble v. Keyes, 9 Gray, 221 , and in very many other cases. There is nothing in the authorities cited by appellant in conflict with this view.

Appellant claims that he was entitled to recover for the damages sustained by the continued operation of the railroad after the settlement and judgment in the former case. This claim conflicts with the authorities already cited, but under Hopkins v. Railroad Co., 50 Cal. 190 , and Ford v. Railroad Co., 59 Cal. 290 , there might be some force in the argument, if there was anything in the case upon which to base it. But the record shows that plaintiff admitted that he had no claim for damages to the lot in block 19, accruing after the date of the former complaint, and it fails to show any proof of damages to either lot after that date.

Appellant also, claims that he was entitled to recover for the damages to his lot in block 19 by reason of the *422 construction and operation of the switch and side-track. The court ruled in his favor in that regard, and he proved the fact of the construction and operation of the switch and side-track, but his record fails to show that he offered to prove any damages by reason thereof. We cannot therefore disturb the verdict of the jury in that regard.

Appellant also complains of the action of the court in permitting the answer to be amended after the jury was impaneled, and in denying his subsequent motion to> strike out the amendment. This was a matter entirely in the discretion of the court. The plaintiff does not seem to have been taken by surprise, or to have suffered any injury therefrom, and we do not perceive that there was any abuse of discretion.

Judgment and order affirmed.

Paterson, J., concurred.