delivered the opinion of the court.
According to the view we take of the case, it is not necessary to inquire into the special equities set forth in the bill and, relied upon in the argument for complainant to show that this record presents a case for the interposition of a federal court, for the purpose of restraining the assessment or collection of a' state tax. The primary and fundamental ground on which the maintenance of such a suit rests is the unlawfulness of the tax against which relief is sought, or, in other words, the invalidity or unconstitutionality of the legislative act under the authority of which the tax is imposed. It is true that this ground is not in itself sufficient. But when the illegality of the tax or the invalidity, or unconstitutionality of the legislative act under which it is imposed is established, it becomes necessary to go further, and make out a case that can be brought under some recognized head of equity jurisdiction: such as, that the collection of the tax sought to be restrained may entail a multiplicity .of suits; or cause some other irreparable injury, as, for instance, the ruin of complainant’s business; or, where the property is real estate, throw a cloud upon the title of the complainant.
Shelton
v.
Platt,
It - is contended in behalf of the complainant (1) that the statute of .Missouri, under the provisions of which the tax sought to be restrained is levied, imposes a tax upon interstate *349 commerce, and to that extent is forbidden by the Constitution of the United States, and is, therefore, void; (2) that the act denies to the complainant the equal protection of the laws of the State of Missouri, and is, therefore, void by reason of its being violative of the fourteenth amendment of the Constitution of the United States; and, (3) that the act is not uniform and equal in its operation, and is void by reason of its repugnance to section three of article ten of the constitution of the State of Missouri.
We do not think that these propositions, taken in connection with-the averments of the bill, present any ground justifying the interposition of a court of equity to enjoin the collection of the tax imposed by the statute in question. The first proposition, that the statute imposes a tax upon interstate commerce, and is, therefore, violative of what is known as the commercial clause of the constitution, is unsound. It is well settled that a State cannot lay a tax upon interstate commerce in any form, whether by way of duties laid on the transportation of the subjects of that commerce, or the receipts derived from that transportation, or on the occupation, or business of' carrying it on; for the reason that such taxation is’ a burden on that commerce and amounts to a regulation of it which belongs to Congress.
Lyng
v.
Michigan,
The 'second and third propositions stated above are reducible to the single contention, that the act in question violates the requirements of uniformity and equality of taxation prescribed *351 by the constitution of Missouri,' and thereby denies -to the complainant the equal protection of the laws of the State which the Fourteenth Amendment to the constitution guarantees shall not be abridged by state action.
This court has repeatedly laid down the doctrine that diversity of taxation, both with, respect to the amount imposed and the various species of property selected either for bearing its burdens or for being exempt from them, is not inconsistent with a perfect uniformity and equality-of taxation in the proper sense of those -terms; and that a system which imposes the same tax upon every species -of property, irrespective of its nature or condition or. class, will be destructive of the principle' of uniformity and equality in taxation and of a just adaptation of property to its burdens.
The rules of taxation, in this respect, were wTell stated in the opinion of the court, delivered by Mr. Justice Bradley, in
Bell’s Gap Railroad
v.
Pennsylvania,
In
Home Ins. Co.
v.
New York,
The contention of the complainant, however, in this connection is, that the rule of uniformity and equality of taxation is destroyed by the arbitrary discrimination involved in the definition of what shall be taxed under the act, imposing upon certain persons or associations taxes from which other persons or companies of precisely the same kind, doing exactly the same kind of business, under exactly the same conditions, are exempt. In other words, the contention is, that the act of the legislature arbitrarily defines what shall constitute an. express company, and then lays a tax upon its business, while at the same *353 time it permits the same kind of business to be done by any person or company not embraced within the class thus defined, without being subject to any tax at all. It is said that the act, by the very terms of its definition, restricts the tax to persons or corporations-who carry on the business of transportation on contracts for hire with railroad or .steamboat companies doing business within the State; and that it permits any person or company that may be so fortunate as to own its own means of transportation to go free from any such tax. That is to say, an express company that engages for hire a railroad or steamboat company to transport its merchandise must pay a tax for the privilege of doing, business, while the railroad or steamboat company owning its own means of transportation might, in connection’ with the business for which it was primarily chartered, engage in the express business without paying’ any tax whatever on the privilege of carrying on such express business. It is strenuously argued, therefore, that this is an unjust discrimination against the express companies defined by the act, and in favor of other companies or persons that may, in connection with their primary of original business, engage in the express business, or that may carry on a separate express business, owning their own means of transportation.
The fallacy of this argument lies in the assumption that the definition of what shall constitute an express company excludes from the classification companies which are as much engaged in the business, or as much under the same conditions, as are those which, under the definition,, are subject tó the tax.
The legislation in question cannot, be considered as invidiously discriminating against the express companies defined by it and in favor of other companies or persons that may carry ..express matter on certain other conditions or under different circumstances. ' There 'is an essential difference between express companies defined by this act and railroad or steamboat companies or other companies that own their .own means of transportation. The vital distinction is this: • Eailroad companies pay taxes on their road-beds, rolling stock and other
*354
tangible property as well as, generally, upon their franchise; and steamboat companies likewise pay a tax upon their tangible property. This tax is not necessarily an
ad valorem
tax at the same rate as is paid on other private property in the State belonging to individuals. Generally, indeed, it is not, but is often determined by other means and at different rates, according to the will of the state legislature.
Kentucky Railroad Tax Cases,
The opinion of the court below on this branch of the case is elaborately argued, and is conclusive. We concur in the reasoning of it as well as in the language employed, and refer to it as a correct expression of the law upon the subject.
Decree affirmed.
