Whenever the qualified electors of any city of the primary class, city of the first class, city of the second class, or village shall vote at any general or special election to acquire and appropriate, by an exercise of the power of eminent domain, any waterworks, waterworks system, electric light plant, electric light and power plant, heating plant, street railway, or street railway system, located or operating within or partly within and partly without such city or village, together with real and personal property needed or useful in connection therewith, if the main part of such works, plant, or system be within such city or village and even though a franchise for the construction and operating of any such works, plant, or system may or may not have expired, then such city or village shall possess and have the power and authority, by an exercise of the power of eminent domain to appropriate and acquire, for the public use of such city or village, any such works, plant, railway, pipelines, or system. If any public utility properties supplying different kinds of service to such city or village are operated as one unit and under one management, the right to acquire and appropriate, as provided in sections 19-701 to 19-707, shall cover and extend to the entire property and not to any divided or segregated part thereof, and the duly constituted authorities of such city or village shall have the power to submit such question or proposition, in the usual manner, to the qualified electors of such city or village at any general city or village election or at any special city or village election and may submit the proposition in connection with any city or village special election called for any other purpose, and the votes cast thereon shall be canvassed and the result found and declared as in any other city or village election. Such city or village authorities shall submit such question at any such election whenever a petition asking for such submission, signed by the legal voters of such city or village equaling in number fifteen percent of the votes cast at the last general city or village election, and filed in the city clerk’s or village clerk’s office at least sixty days before the election at which the submission is presented, but if the question of acquiring any particular plant or system has been submitted once, the same question shall not again be submitted to the voters of such city or village until two years shall have elapsed from and after the date of the findings by the board of appraisers regarding the value of the property and the city’s or village’s rejection of such question.