Baldwin, C. J.

The Connecticut Railway and Lighting Company, the predecessor in title of the defendant, having a franchise from the State for the construction and operation of a railway in certain streets in the city of Waterbury, submitted to the city authorities a plan for exercising this franchise with respect to some of these streets, pursuant to General Statutes, § 3823. This provided that before any such company should proceed to construct a railway or lay new tracks, it should “cause a plan to be made showing the highway or highways in and through *650 which it proposes to lay its tracks, the location of the same as to grade and the center line of said highways, and such changes, if any, as are proposed to be made in any highway,” and that “said plan shall be presented to the mayor and court of common council of each city . . . within which such company proposes to operate its railway, who shall thereupon, after public notice, proceed to a hearing of all parties interested therein, and after such hearing may accept and adopt such plan, or make such modifications therein as to them shall seem proper, and shall, within sixty days after the presentation of such plan, notify such company in writing of their decision thereon and of such modifications therein as they have made”; and that “no such company shall construct such railway or lay additional tracks, except in accordance with a plan approved by the authorities aforesaid, or approved on appeal, by the railroad commissioners or'the superior court, as provided in §§ 3832, 3833, and 3834.”

The plan presented was an entirety. It was denominated a plan for an “Extension from East Main Street to the Pearl Lake Road.” The proposed location started in East Main Street, and was to end at the Pearl Lake Road, reaching the latter by way of Chapel Street.

The approval of the plan was an approval of it in its entirety. Such an approval, either by the city authorities or given upon an appeal from their action, was a condition precedent to the location of such an extension. Central Ry. & Elec. Co.’s Appeal, 67 Conn. 197, 210, 35 Atl. 32.

The right to make a location of a railway or of any part of it is a power of election, and when once exercised is exhausted, in the absence of a statute to the contrary. Hartford & C. W. R. Co. v. Wagner, 73 Conn. 506, 509, 48 Atl. 218. The location by the Connecticut Railway and Lighting Company of its extension from East Main Street to the Pearl Lake Road has been made. It has been made and approved as a whole. . The company did not thereby come *651 under an obligation to enter upon the construction of the piece of road thus located. But it did come under an obligation, if it should enter upon the construction of that piece, not to stop when it had constructed part of it, and proceed to operate cars upon that part, without going forward further, within a reasonable time, to complete the extension.

The city authorities had power to modify the plan submitted as a condition of their approval, in any way legitimately affecting one or more of the particulars which the statute required such plans to specify. One of these particulars was the grade proposed for the tracks: another was the change, if any, to be made in any highway. The city authorities were of opinion that changes were proposed in the plan with respect to that part of the route running from Baldwin Hill to the terminus of the extension, which required modification. Their approval was therefore conditioned on the company's bringing the street, in that part of the extension, throughout its full width, to a specified grade, and putting it, both within and outside of the railway tracks, in good condition for public travel. Another condition required this and certain other work to be completed, and the whole extension to be put in operation, by November 15th, 1904.

These conditions were strictly modal. They related to the manner of proceeding. The first guarded the public against irregular grades and too narrow a roadway: the second guarded the public against unnecessary delays in the performance of the work, and insured their receiving the full benefit of the entire extension, if any part of it were constructed and used. Both were germane to the plan of location. Central Ry. & Elec. Co.’s Appeal, 67 Conn. 197, 214, 219, 35 Atl. 32; Waterbury’s Appeal, 78 Conn. 222, 225, 61 Atl. 547.

It is argued that, since the State had given the company a right to locate its railway in the streets in question *652 within a period which would not have elapsed on November 15th, 1904, this time could not be shortened by the city. This right of location, however, was given subject to the approval and control in certain particulars of the city authorities. It was a qualified, not an absolute right. The company could not begin the laying of a track by digging up the pavement in a busy thoroughfare and leave things in such a shape for months or years. It must act reasonably in the exercise of its franchise, and the General Assembly left it with the municipal authorities, in the first instance, to see that it should so act. The order of approval now in question was in effect a declaration by proper agents of the law that the public interest required that the particular extension contemplated should, if undertaken, be carried to completion during the current season.

It follows that the specific ground on which the memorandum of decision indicates that the writ was quashed was insufficient. Part of the extension approved having been constructed and put in operation, by the Connecticut Railway and Lighting Company, it came under an obligation, so far as appears from the writ, to build the rest of it, and put that in operation; conforming, as respects so much of the route as runs from Baldwin Hill Street to the terminus at Pearl Lake Road, to the condition imposed by the city in that regard.

If the entire extension had been so completed and put in operation, it is certain that no part of it could have been subsequently abandoned, at the will of the company. State v. Hartford & N. H. R. Co., 29 Conn. 538, 547. The reasons for this apply conversely. The benefits and the burdens coming from the conditional approval of the location go together. It was not within the company’s power to accept and take advantage of what it deemed beneficial, and yet escape the burdens incident to a full completion of the extension in the manner authorized.

It appears from the judgment-file that the Superior *653 Court found all the issues for the defendant, and adjudged the writ insufficient. If, therefore, any of the grounds assigned for quashing it were valid, there was no error.

The first ground was that the defendant was no party to the proceedings had in 1904. This is immaterial, since its succession to the rights, franchises, and obligations of the Connecticut Railway and Lighting Company came at a later date;

The third, fourth, and fifth grounds were that the condition requiring the completion of the extension by November 15th, 1904, merely limited the time within which the Connecticut Railway and Lighting Company could have constructed it; and that, this time having expired, the defendant had no right to complete the construction, and could not be commanded to complete it.

The Connecticut Railway and Lighting Company could not have set up, as against the State, that it had not completed the extension by November 15th, 1904, as an excuse for not subsequently proceeding to complete it. No one can profit by his own wrong. The writ alleges that all its rights, duties, and obligations passed to the defendant in 1907. The latter stands, therefore, as to this matter, in the shoes of its lessor.

The sixth ground is that “no request or demand has ever been made of the respondent to complete the construction of said line. ” A motion to quash serves the purposes of a general demurrer, and cannot be supported by allegations of fact. But if the averment is to be construed as importing that the writ shows no request or demand, a sufficient answer is that it directly alleges a refusal to complete the work, which is enough, so far as such a motion is concerned. Brainard v. Staub, 61 Conn. 570, 575, 24 Atl. 1040.

The seventh ground is that the laws of the State and not the mayor and aldermen of Waterbury control the use .by the public of the defendant’s street railway, and the in *654 terest of the public in its operation. This claim has been already discussed in connection with the second of the grounds set up in the motion; but it may be added that the writ is entitled'the “State of Connecticut ex rel. The City of Waterbury v. The New York, New Haven & Hartford Railroad Company,” and is a proceeding in which the State, as the party plaintiff, is seeking to enforce its laws.

The eighth ground assigned is that the General Assembly, in 1905, validated and confirmed the location and construction of the railway, as located and constructed in the highways described in the original petition to the city authorities, “through Baldwin street to its intersection with Chapel street at Baldwin Hill or Piedmont street.” In an amendment of its charter in the year named (14 Special Laws, p. 704), it is provided that “the location and construction of all tracks, switches, cross-overs, fixtures, poles, wires, and appurtenances heretofore located and constructed by said company, or any of its underlying or constituent companies, now controlled and operated by said company, are hereby validated and confirmed as at present existing for the use, benefit, and enjoyment of said company; and it is also authorized to carry persons, goods, and property over any or all of its lines of railway, any charter provision to the contrary notwithstanding.”

The State, in this action, is not challenging the right of the defendant, as lessee of the Connecticut Railway and Lighting Company, to hold, maintain, and operate so much of the railway route from East Main Street to Pearl Lake Road as was located and constructed in 1905. Its complaint is that, whereas part of that route has been constructed and is being operated, that part running through Chapel Street to the Pearl Lake Road has not been. This assumes that what has been done is lawful so far as it goes, and simply insists that a franchise to lay a railway on a certain route, which has been in part executed, shall be wholly executed.

*655 The ninth ground is laches. The defendant did not acquire title until a day not specified in 1907. The application for the writ of mandamus was made January 17th, 1908. There is clearly no laches apparent as respects the defendant, unless it can rely on a delay to proceed against its predecessor in title. But if so, and if laches is ever available in defense to such an action by the State, a delay of three years in bringing before the courts a controversy of this nature called for no explanation, in the first instance, on the face of the writ.

It follows that the motion to quash was wholly without merit.

In the argument in this court, the defendant has set up a claim, not made in the motion to quash, that mandamus does not lie to compel the performance by a private corporation of any particular act, unless it be a corporate act specially commanded by law. As this objection strikes at the foundation of the action, we think it proper to consider it.

General Statutes, § 3824 (see Public Acts of 1907, p. 806, Chap. 219), provides that the mayor and common council of each city shall have, in the first instance, exclusive control over the placing of street-railway tracks in the city streets, and of changes in grade of such railway, and, if any railway company shall fail to obey their orders in those respects, “may proceed by a writ of mandamus to compel such company, at its own expense, to carry out such orders.” Such writs have been frequently issued. Hartford v. Hartford Street Ry. Co., 73 Conn. 327, 47 Atl. 330; State ex rel. Howard v. Hartford Street Ry. Co., 76 Conn. 174, 56 Atl. 506. The procedure may be by a writ in the name of the city. There is no reason why it may not also be by a writ in the name of the State on the relation of the city, or in the name of the State alone.

The State can always proceed in such an action to enforce a legal duty created by an authority to which it has *656 entrusted the power to create it. When it invested the city of Waterbury with power to make orders of the kind now in question, it charged those against whom such orders might be directed with the duty of obeying them. Their obligation was therefore one imposed by law. Basset v. Atwater, 65 Conn. 355, 363-365, 32 Atl. 937.

There is error, the judgment is reversed and the cause remanded to be proceeded with according to law.

In this opinion the other judges concurred.