The railroad partakes of two natures, that of a highway and that of a common carrier. Railroad companies therefore enjoy the privileges and assume the duties of both. The State justly exercises in behalf of such companies the right of eminent domain, _i. e._, the right of the sovereign to apply private property to public use; but it cannot rightfully appropriate private property for private use, even if legal compensation were to be made for it. It is only upon the theory that railroads are highways, constructed for the public good and subject to public control, that the State has authorized railroad companies to take private property for their own use by paying for it a reasonable compensation. A railroad may even take possession of and intersect a public road for the purpose of carrying on its functions. But while the sovereign may exercise the right of eminent domain, it cannot delegate it to any individual or number of individuals, except to its agents, performing its functions and being bound to comply with any rule which may be prescribed for the public good. Under the common law the individual is entitled to as full use of the railroad as he is of the common highway. If he is not allowed to put on his own vehicle, this restriction is simply due to the fact that the people believe that the business can be done most safely, most economically and most efficiently by one company or a limited number of companies operating the road for a reasonable compensation. Nor does this restriction differ materially from that which the law has placed upon the use of the common road. Without legislative sanction no one has a right to put upon it a team of elephants or a locomotive and train of cars, or other strange motors, and thereby obstruct the public travel. These restrictions might be removed by the legislative power, and there is also no doubt that under the common law the State has the right to permit the independent use of the railroad track by any person having motive power and cars adapted to it. The persons and freight transported on the railroad are taxed to maintain it, while in the case of the common road this tax is placed upon the people and the adjoining property. How to collect the tax necessary to sustain the road is simply a question of public policy, and it cannot be collected in any case except with the expressed permission of the State. If a company is permitted by the State to operate a railroad it should only be permitted to collect such tolls as are just and reasonable, and what is just and reasonable should be determined by the sovereign State, and not by the operating company. The railroads of the United States collect from our people in round numbers a transportation tax of eleven hundred million dollars annually. This tax is equal to a levy of $17 per head, or $85 per family; it is about as large as all our other taxes combined. In the State of Iowa it amounts to about $22 per head, or $110 per family, and is two and