The difficulty here arises from the fact that the Legislature has not in terms provided for a case in which the mileage of a street railway has been of different lengths at different times of the year, according as it has been increased or diminished by new construction or abandonment, by purchases or sales, or, as here, by consolidations of different companies.
It was provided by St. 1906, c. 463, Part III. § 133, as follows: “A street railway company, including a company whose lines are located partly within and partly without the limits of the Commonwealth, whether chartered or organized under the laws of this Commonwealth or elsewhere, shall annually, on or before the fifteenth day of October, make and file in the office of the board of assessors of every city and town in which any part of the railway operated by it is situated a return signed and sworn to by its president and treasurer, stating the length of track operated by it in public ways and places in such city or town, and also the total length of track operated by it in public ways and places, determined as provided in section one hundred and twenty-five, and also the amount of its gross receipts during the year ending on the preceding thirtieth day of September, including therein all amounts received by it from the' operation of its railway, but excluding income derived from sale of power, rental of tracks or other sources.” And by § 134 it was provided that on or before the first day of November annually, the assessors of every city or town in which a street railway was operated should assess upon the company operating the railway an excise tax, to be assessed upon the average gross receipts per mile according to the proportions between the length of tracks operated by it in public ways and places in such city or town and the total length of tracks operated by it in public ways or places. This tax is assessed in lieu of the obligations formerly imposed on street railway companies to keep in repair certain parts of the public ways and places in which their tracks are laid. Greenfield & Turners Falls Street Railway v. Greenfield, 187 Mass. 352. A *520method was provided therefore by petition to the board of railroad commissioners for the revision of the amount of this excise or commutation tax; and it was enacted by § 137 of the same statute, as amended by St. 1907, c. 318, that the total amount of this tax received by a city or town should be applied towards the repair and maintenance of its public ways and the removal of snow therefrom. See now St. 1909, c. 490, Part III. §§ 47-51.
The petitioner’s contention, which was adopted in the Superior Court, is that in such a case as this the statute requires each one of the original companies to make a return to each city or town for the period during which it actually operated tracks in such city or town before the consolidation; that the consolidated company must make a return of the gross earnings actually received by it during the year and of the length of its trackage on the thirtieth day of September; and that the tax of each company is to be determined by dividing its gross earnings by the number of miles operated by it on the last day of the period of its earnings, — that is, upon the thirtieth day of September if the company was then in existence and operating its road. It is only the last part of this contention however that it now is necessary for us to pass upon; for the parties have agreed that the assessment here in question, although made to the petitioner, may be treated as if it had been made to the consolidated company, the Middlesex and Boston Street Railway Company, and that if upon the agreed facts the assessors of Wellesley could upon any theory have assessed the tax which they did assess, the tax is to stand. And likewise it is not disputed that if the correct divisor of the total gross receipts of the consolidated company for the year ending September 30, 1909, was the number of miles operated by it on that day, the abatement made by the Superior Court was proper.
The respondent makes two alternative contentions. First, it contends that the proper divisor of the total earnings of the consolidated company for the year ending September 30 was not the number of miles operated by the company on that day, a number much increased by the consolidations which had been made during the year, but the average number of miles of track operated during the year. This contention it presented to the judge at the trial directly by its fourth and sixth requests for rulings, and *521indirectly by its eleventh request. Its second contention was that the entire system of the consolidated company as it existed on September 30, 1909, should be taken as one system for the entire year ending on that day, for the purpose of assessing this excise or commutation tax,—in other words, that a tax should be assessed upon the consolidated company as if the consolidatians had been made before the beginning of the tax year instead of having been made during the year, and should be assessed upon the total earnings received during the year by the constituent companies and the consolidated company taken together. It presented this contention to the judge by its fifth, tenth and twelfth requests and part of its seventh request. Its first and thirteenth requests were made upon both of its contentions. Its first, third and eleventh requests were for rulings adverse to the petitioner’s contention. Its second and most of its seventh requests were given. Its eighth request becomes immaterial when the others shall have been passed upon.
The section (Sts. 1906, c. 463, Part III. § 133; 1909, c. 490, Part III. § 47) which requires a return of the total length of track operated does not fix the date upon which that length is to be taken, unless by inference. It is obvious that the length might be different at different periods of the year. But the section contains two provisions which throw some light upon the question to be decided. The return is to be made on or before the fifteenth day of October, and it is to state the length of the tracks in the particular city or town to whose assessors the report is required to be made; and the total length of tracks operated by it in other public ways and places, and also the amount of the gross receipts during the year ending on the preceding thirtieth day of September. That is, the statutory command contemplates a closing of the accounts of the company so as to show the gross receipts of the year as of a fixed date. In the absence of any fixing of the day on which the length of the tracks was to be determined, it would be natural to say that the same day was contemplated for this purpose as was fixed for the statement of the gross receipts. The day intended could not be a day either before or after the thirtieth day of September; and it seems to us, when there is no such expression of the legislative will, that it would be putting a strained construction upon the words of *522the statute to say- that they required a computation of the average number of miles operated during the year in each city or town and in the aggregate line of the road. But another criterion is furnished by the statute. It prescribes as a rule for determining the length of track that it is to be “ determined as provided in ” § 125 of St. 1906, c. 463, Part III.; § 40 of St. 1909, c. 490, Part III. Referring to these two sections, we find that in slightly different words, but with manifestly the same meaning, they require street railway companies to state in their returns the length of track operated by them in each city or town on the thirtieth of September, to be determined by measuring as single track the total length of all tracks operated by them, including sidings and turn-outs, whether owned or leased by them, or over which they have trackage rights only. It is plain that under the rule here prescribed the companies must not only measure the length of their tracks by including all sidings and turn-outs and by treating all tracks, whether single or double, as single tracks, but this method of measurement must be applied to the state of things existing on the thirtieth day of September. A return of measurements made on any other day, or of the average length of tracks where there had been during the year any new construetian or abandonment or any other change of trackage, would not comply with the requirements of the statute. The fact that in. practice the fixing of the day upon which the facts are to be ascertained is of quite as much importance as determining the mode of measurement to be adopted, makes it at least probable that the reference in the one section to the other was intended to include the first element as well as the second. Both of these elements are alike essential in making a true statement of the length of trackage operated.
It is said in behalf of the town that taking the mileage as of the last day of the tax year works an injustice, in that the gross earnings per mile of track are unduly decreased by dividing the total earnings by a length of mileage of which a part, possibly a large part, has not been in existence and has earned nothing during perhaps a large part of the year. But the same argument might be made as to the distrihution of the corporate franchise tax provided for by St. 1909, c. 490, Part III. § 43, which under § 64 of the same act is to be “ apportioned among the *523several cities and towns in proportion to the length of tracks operated by such company in said cities and towns respectively.” This length of tracks must by the terms of § 40 of the same act be the length measured as therein prescribed upon the thirtieth day of September; and any city or town in which there had been a large increase of trackage during the preceding year, or a great diminution of trackage during that time, would receive proportionally an increased or diminished share of the corporate franchise tax to the corresponding loss or gain of the other cities or towns in which the same company had tracks. The truth seems to be that to avoid the necessity of making unduly complicated computations and because in the long run there seemed no likelihood of serious injustice even if there might be some temporary inequalities, the Legislature saw fit to provide that in those matters the determination should be made in all respects as of a fixed day, just as in the assessment of ordinary taxes individuals are to be taxed upon such taxable property as they are found to possess upon a day certain, although when the amount of their tax has been ascertained and becomes payable, it generally will be the case that some persons will have to pay a tax upon an amount in excess of what they are worth while others will find that large amounts of property which they have acquired since the day of assessment have wholly escaped the burden of taxation. In each case, the Legislature has reasonably determined that in this way the private burden and the public benefit of taxation will be distributed and received as justly and proportionately as is really practicable; and this contention we cannot revise.
For similar reasons, we cannot adopt the second contention made by the town. We find nowhere in the statutes any reference to such a mode of computation .or any indication that this was intended by the Legislature. A consolidated company does succeed to all the liabilities and obligations of its constituent companies. It must pay the taxes for which they were liable. It must make its own returns and pay its own taxes. But we know of no authority and no ground of principle for saying that consolidations which took place respectively in December of 1908 and July of 1909 can be treated by assessors of taxes as having taken place before September 30, 1908. What we have *524said as to a disregard by the Legislature of some temporary inequalities in the assessment and distribution of this excise or commutation tax by the assumption of a day certain for the making up of all accounts and the ascertainment of the then existing state of affairs, applies also to this contention.
Moreover it must be borne in mind that this claim of the town, if adopted, would be applicable, not only to a case of consolidation such as is here presented, but to eases where the road of one company has been purchased or acquired under adversary proceedings by another. We gather from an opinion of the Attorney General, to which we have been referred by counsel (Attorney General’s Report for 1908, p. 2), that a part of the system of the present consolidated company was purchased by it in July, 1907, from the receiver of another company. If so, the receiver, who doubtless would need the books of the insolvent company for his own purposes, probably did not turn them over to the purchasing company, and that company would be unable to make in the next October the returns as to the operations of the insolvent company between September 30, 1906, and July, 1907, which according to the present contention of the town it would be bound to make under a penalty. Other situations readily can be imagined in which a company would be unable to give the previous gross receipts of other companies whose lines it had acquired. Nor if the officers of those acquired companies had failed to keep proper books of account or had falsified their accounts, would it be just to visit a penalty for such wrongdoings upon the acquiring company, which presumably acted with complete innocence. We ought not to suppose, in the absence of provisions of the statutes, that the Legislature intended to impose a penalty upon a corporation for anything but its own act or the act of its authorized officers or agents.
We are led to the conclusion that the contention of the petitioner is correct, that the gross earnings per mile of a street railway company under our statutes, certainly of such a company actually operating its road on the thirtieth day of September, must be ascertained by dividing its total gross receipts for the year by the number of miles of its trackage upon that day.
It follows that the respondent’s exceptions must be overruled.
So ordered.