delivered the opinion of the court.

The rails of the main line of the West Shore Railroad Company extend from Buffalo to Albany, New York, and beyond through the State of New York into New Jersey to the terminus of the road at Weehawken on the west *257 bank of the Hudson river. From Weehawken steam ferries known as the West Shore Railroad ferries are operated over the river to several terminal points in New York City for the purpose of carrying railroad passengers and traffic from Weehawken to New York and from New York to Weehawken. Although these ferries are known as West Shore Railroad ferries and are operated as railroad ferries, their business is not limited to incoming persons or traffic carried over the lines of the railroad or to persons or traffic conveyed from New York to Weehawken to be transported from .there over the railroad.' Indeed, from both directions á very large number of persons besides considerable traffic “constantly move to and fro between the two States, pot having, used or intending to use the lines of the West Shore Railroad.”

In 1905 the Board of Chosen Freeholders of Hudson County, New Jersey, adopted two ordinances, one fixing the rate for foot passengers ferried from New Jersey to New York and the other for a round trip commencing on the New Jersey shore, which rates were applicable to the ferries in question. The New York Central & Hudson River Railroad, engaged as a lessee in operating the lines of the West Shore Railroad and its railroad ferries, commenced this proceeding to prevent the enforcement of the rates fixed by the ordinances. The contention was that the ordinances were an unwarranted interference with the interstate business of the company and that the enforcement of the ordinances would constitute a direct burden on interstate commerce, which couid not be done consistently with the Constitution. The Supreme Court of New Jersey maintained the contentions of the railroad company. The Court of Errors and Appeals reversed the judgment of the. Supreme Court. 76 N. J. Law, 664. The case is now here, the writ of error having been directed to the Supreme Court, to which the record was remitted from the Court of Errors and Appeals.

*258 At the outset it is to be observed that the contentions' pressed in argument-by both parties take a wider range than the necessities of the case require. We make a very brief reference to certain, decisions of this court referred to in argument by both parties in order that they may aid us to plainly mark the boundaries of the real issues required, to be decided, thus enabling us to put out of view irrelevant considerations and confine our attention to things essential. ■ '

Fanning v. Gregoire, 16 How. 524, required a consideration of the right of. the legislature of Iowa to authorize a ferry across the Mississippi river at Dubuque. Without going into details it suffices to say that the subject was elaborately considered and the power of the State to. grant the ferry right wassustained. In Conway v. Taylor’s Executors, 1 Black, 603, the right of the State of Kentucky to grant franchises for ferrying across the Ohio river, was considered -and the power was upheld, the general reasoning stated in Fanning v. Gregoire being reiterated and approved. It is undoubtedly true that in the course of the reasoning of both the cases just referred to. expressions were made use of which give some support to the view that the power to regulate ferriage, even as to a stream bounding two States, was purely local, not transferred by the States'to Congress, and therefore not within the grant of power to Congress to regulate commerce.

Gloucester Ferry Co. v. Pennsylvania, 114 U. S. 196, concerned the validity of a tax imposed by the State of Pennsylvania on a ferry company operating between Gloucester, New Jersey, and the city of Philadelphia. -The tax'was resisted on the ground that it was a direct burden on interstate commerce and therefore void as an interference With The power of Congress to regulate commerce. The contention was sustained. The whole subject of ferriage was elaborately considered, and in the course of the opinion it was expressly declared, after *259 considering the decisions in Fanning v. Gregoire and Conway v. Taylor’s Executors, that ferriage over a stream constituting a boundary between two States was within the grant to Congress to regulate commerce, and therefore not subject to be directly burdened by a State. It was also, however, held that in view of the character of such ferries and the diversity of regulation which might be required, the right to regulate them came within that class of subjects which although within the power of Congress the States had the right to deal with until Congress had manifested its paramount and exclusive authority.

In Covington Bridge Co. v. Kentucky, 154 U. S. 204, the right of the State of Kentucky to impose tolls for use of a bridge across the Ohio river, was challenged on the ground that the State had no authority to fix the tolls, because to do so was the assertion of a power to regulate commerce and therefore was an interference with the exclusive power of Congress oh that subject. The tolls were held to be invalid. The opinion beyond question reasserted the principle enforced in the Gloucester Ferry Casé, that the movement across a stream, the boundary between two States, was within the grant of power to Congress to regulate commerce and therefore, generically speaking, not subject to the exertion of state authority. Indeed, in view of the fact that there was no act of Congress dealing with the subject of the tolls which were ' under review in the Covington Case, .it is true to say that there are expressions in the opinion in that case which have been considered, whether rightly or wrongly we do not feel called upon to say, as qualifying or 'overruling the conclusion expressed in the Gloucester Case as to the power of a State to regulate ferries upon a stream bordering two States until Congress had manifested its purpose to exert its authority over the subject.

In St. Clair County v. Interstate Transfer Co., 192 U. S. 454, the question considered was the liability of the *260 Transfer Company to penalties imposed by the County of St. Clair, a municipal corporation of the State of Illinois, for having failed to obtain a license “for carrying on a ferry for transferring railroad cars, loaded or unloaded, over the county of St. Clair in Illinois to the'Missouri shore and from the Missouri shore to the county of St. Clair.” It was decided that there was no liability for the penalty (a) because the business of transferring freight cars in, the sense disclosed was not ferriage in. the proper meaning of that word, and was the transaction of interstate commerce not in any view subject- to state control; and (b) because the particular ordinance relied upon as the basis for imposing the penalty was void because of provisions discriminating against interstate commerce which it contained. The cases of Fanning v. Gregoire, Conway v. Taylor’s Executors, Gloucester Ferry Co. v. Pennsylvania and Covington Bridge Co. v. Kentucky were referred to. It was expressly declared in view of the special grounds upon which the case was decided that it was unnecessary to consider whether the decision in the Covington Bridge Case had established tb ^ doctrine that the interstate business of ferrying over navigable rivers bordering two States was exclusively within the authority of .Congress to regulate, and therefore was not, as declared in the Gloucester Ferry Case, subject to state regulation until Congress had exerted its authority over the matter.

In the light of this statement we come to state the contentions of the parties. The plaintiff in error insists, not following the exact order of its argument, a, that the assailed ordinances are repugnant to the commerce clause because Congress' has legislated concerning railroad ferries and thereby manifested its purpose that there should be no longer room for the exertion of state power on the. subject; and, b, that if this is not so it is. now necessary to- pass on the question reserved in the St. Clair Case, and to decide that the ruling in the Covington Bridge Case *261 affirmatively established that interstate ferriage like that here in question is so absolutely within the power of Congress as to exclude even in case of the inaction of Congress the presumption of a license for the exercise of state power. On the other hand, the argument for the defendant in error is this: That the carrying on of the business of ferriage on navigable rivers constituting a boundary between States is not interstate commerce, that the power to regulate it was not surrendered by the States and consequently no authority was given over the subject to Congress. This is sought to be shown by a copious review of adjudged cases, and by an analysis' of what it is urged was the clear intendment of the opinion in Gibbons v. Ogden, especially as elucidated by the opinions in Fanning v. Gregoire and Conway v. Taylor’s Executors. It is not denied that these theories are directly contrary to the ruling in the Gloucester Ferry Case, but it is urged that that case for the first time announced the doctrine of a national power over interstate ferriage and therefore practically amounted to making a new constitutional provision on the subject. Obviously, however, the views just stated are advanced in a mere academic sense, since the argument admits that the ruling in the Gloucester Ferry Case is now conclusive and has settled the signifi-' canee of the Constitution contrary to the views mentioned. Thus, at the very outset of the argument, after stating and elaborating the theory of exclusive state power over interstate ferriage, it is said: “The decision of the Gloucester Ferry Case, 114 U. S. 196, decided in 1885, estab-i lished Federal jurisdiction to legislate concerning ferriage over boundary streams, but did not turn what had been an exclusive state jurisdiction into an exclusive Federal jurisdiction. State laws on this subject are still valid until superseded by a Federal statute.” Again, after' copiously reiterating the conceptions as to the novelty of the ruling in the Gloucester Ferry Case and its assumed *262 conflict with what had gone before, it is said: “The result of the Gloucester Ferry Case, therefore, with the other cases which, have followed, has probably been to so extend the Federal authority over interstate ferriage as to bring the subject within the concurrent jurisdiction of Congress and of the States. It is a concurrent jurisdiction only, however, which has been established. In the absence of Federal legislation the States have all the power that they have been accustomed to exercise.” Thus conceding the controlling force of the Gloucester Ferry Case and therefore not questioning the power of Congress which that case upheld, it is urged that the Covington Bridge Case should not be now held to have overruled or qualified the Gloucester Ferry Case so as to exclude the States from any right to regulate interstate ferriage before and until Congress has manifested its intention to exert its authority by dealing with the subject. Upon the assumption thus stated it is insisted that the court below rightly upheld the assailed ordinances because there has been no action by Congress exerting its authority over the subject with which the ordinances deal and therefore no room for the contention that it was not within the power of the State to enact them.

It is therefore apparent that the contentions of the plaintiff in error primarily invoke only the controlling effect of the ruling in the Gloucester Ferry Case, and insist that there has been action by Congress which destroys the presumption of authority in the State to act. It follows that the proposition that the Covington Bridge Case overruled the Gloucester Ferry Case is merely subordinate, and need not be considered unless it becomes necessary in consequence of an adverse ruling on the primary contention concerning the application of the Gloucester Ferry Case.

It is equally clear that the contention of the defendant in error as to the absence of all power in Congress over *263 interstate ferries is merely academic. From this it necessarily arises that the only ground relied upon to sustain the judgment below is the ruling in the Gloucester Ferry Case, and the further proposition that there has been no action of Congress over the subject of the ferriage here involved which authorizes the holding that state power no longer obtains. As, therefore, the claim on the one side of an all-embracing and exclusive Federal power may be, temporarily at least, put out of view and the assertion on the other of an absolutely exclusive state power may also be eliminated from consideration because not relied upon or because it is both demonstrated and admitted to be without foundation, it follows that to dispose of the case we are called upon only, following the ruling in the Gloucester Ferry Case, to determine the single and simple question whether there has been such action by Congress as to destroy the presumption as to the existence in the State of vicarious and revocable authority over the subject. We say simple question because its decision is, we think, free from difficulty, in view of the express provision of the first section of the Act to Regulate Commerce (act of February 4, 1887, c. 104, 24 'dtal. 379), subjecting railroads as therein defined’to the authority of Congress, and expressly declaring that “the term railroad as used in this act shall include all bridges and ferries used or operated in connection with any railroad, and also all the road in use by /my corporation operating a-railroad, whether owned or operated under a contract, agreement or lease. . . /’ The inclusion of railroad ferries within the text is so certain and so direct as to require nothing but a consideration of the text itself. Indeed, this inevitable conclusion is not disputed in the argument for the defendant in error, but it is insisted that as the text, only embraces railroad ferries a.nd the. ordinances were expressly decided by the court below only to apply to" persons other than railroad passengers, therefore the action by Congress docs not ex *264 tend to the subject embraced by the ordinances. But as all the business of the ferries between the two States was interstate commerce within the power of Congress to control and subject in any event to regulation by the State as long only as no action was taken by Congress, the result of the action by Congress leaves the subject, that is, the interstate commerce carried on by means of the ferries, free from control by the State. We think the argument by which it is sought to limit the operation of the act of Congress to certain elements only of the interstate commerce embraced in the business of ferriage from State to State is wanting in merit. In the absence of an express exclusion of some of the elements of interstate commerce entering into the ferriage, the assertion of power on the part of Congress must be treated as being coterminous with the authority over the subject as to which the purpose of Congress to take control was manifested. Indeed, this conclusion is inevitable since the assumption of a purpose on the part of Congress to-divide its authority over the elements of interstate commerce intermingled in the movement of the regulated interstate ferriage would be to render the national authority inefficacious by the confusion and conflict which would result. The conception of the operation at one and the same time of both the power of Congress and the power of the States over a matter of interstate commerce is inconceivable, since the exertion of the greater power necessarily takes possession of the field, and leaves nothing upon which the lesser power may operate. To concede that the right of a State to regulate interstate ferriage exists “only in the absence of Federal legislation” and at the same time to assert that the state and Federal power over such subject is concurrent is a contradiction in terms. But this view has been so often applied as to cause the subject to be no longer open to controversy. Chicago, Rock Island & Pacific Ry. Co. v. Hardwick Farmers' Elevator Company, 226 U. S. *265 426. Because in the St. Clair Case, supra, it was decided that a particular character of transportation of interstate commerce was not ferriage and not within state power, even where there had been no action by Congress, affords no reason for in this case extending state authority to a subject to which, consistently with the action of Congress, it cannot be held to apply.-

The judgment of the Supreme Court of the State of New Jersey will be reversed and the cáse remanded for further proceedings not inconsistent with this opinion.

Béversed.