The husband of the plaintiff met his death on July 8, 1912, from injuries received while working for the defendant. The plaintiff brought the first action in her own name and right to recover damages for this death under the Massachusetts employers’ liability act, which in such cases gives a right of action to the widow of the employee. Subsequently, having been appointed administratrix of the estate of her husband, she brought an action as such administratrix under the employers’ liability act of the United States, alleging that the deceased was engaged at the time of his death in service upon a train in interstate commerce. Each of these actions was against' *356the defendant to recover damages for the death of the same person. They came on for trial together in the Superior Court. The judge ruled that the bringing of the action under the federal employers’ liability act had the effect of superseding the action under the State employers’ liability act and of depriving the court of jurisdiction to hear that action during the pendency of the other action. In the action under the State statute he ordered judgment for the defendant and reported the correctness of his ruling to this court.
Even if the presiding judge was right in his ruling, judgment ought not to have been rendered in favor of the defendant in the action under the State statute. A court without jurisdiction over a case cannot enter judgment in favor of either party. It can only dismiss the case for want of jurisdiction.
But we are of opinion that the ruling was wrong. The federal act in the field covered by it supersedes all State statutes. As to matters within the scope of the federal power, legislation by Congress is supreme. So long as Congress had not acted as to liability for injuries received by employees of railroads while engaged in interstate commerce, legislation by the States touching that subject, being within the police power, was valid. But when Congress exerted its jurisdiction to regulate in this respect commerce between the States, State statutes previously operative in that sphere yielded to its paramount and exclusive power. Michigan Central Railroad v. Vreeland, 227 U. S. 59, 66. St. Louis, San Francisco & Texas Railway v. Seale, 229 U. S. 156. Taylor v. Taylor, 232 U. S. 363. Seaboard Air Line Railway v. Horton, 233 U. S. 492, 501. The federal act has no greater extent. It does not undertake to affect the force of the State statute in its appropriate sphere. The State law is as supreme and exclusive in its application to intrastate commerce as is the federal law to interstate commerce. If the employee of a railroad engaged in both interstate and intrastate commerce is injured or killed while in the former service, the carrier’s liability is controlled and must be determined solely by the federal law; if in the latter service, such liability rests wholly upon the State law. Wabash Railroad v. Hayes, 234 U. S. 86.
The facts and not the pleadings determine whether the wrong done in any given case confers a right to recover under the federal *357or under the State statute. The allegations in the plaintiff’s declarations in these two actions do not constitute the test whether the jurisdiction of the court is under the federal or State statute. These simply are the basis for a judicial inquiry into the facts which alone can determine that question. It is a familiar principle that, where inconsistent courses are open to an injured party and it is doubtful which ultimately may lead to full relief, he may follow one even to defeat, and then take another, or he may pursue all concurrently, until it finally is decided which affords the remedy. The assertion of one claim which turns out to be unsound so long as it goes no further, is simply a mistake. It is not and does not purport to be a final choice, nor an election. A party is not obliged to select his procedure at his peril. Jennings v. Wall, 217 Mass. 278, 281, 282. Moore v. Sanford, 151 Mass. 285. Furber v. Dane, 204 Mass. 412, 415. William W. Bierce, Limited, v. Hutchins, 205 U. S. 340, 347. Snow v. Alley, 156 Mass. 193, 195. Brown v. Woodbury, 183 Mass. 279, 281. Rankin v. Tygard, 119 C. C. A. 591, 602. This rule has been followed frequently in actions where it was doubtful whether the remedy of the plaintiff was under our employers’ liability act or at common law. Brady v. Ludlow Manuf. Co. 154 Mass. 468. Howard v. Fall River Iron Works Co. 203 Mass. 273. Murray v. Knight, 156 Mass. 518. D’Almeida v. Boott Mills, 209 Mass. 81. It is equally applicable to the cases at bar. The principle is not changed in any material respect because the question relates to remedies afforded by the statutes of different sovereign powers, each exclusive within its own domain. The relief is sought in the same forum, for the State court has jurisdiction of the cause of action, whichever statute may be controlling. Mondou v. New York, New Haven, & Hartford Railroad, 223 U. S. 1, 57.
There are strong practical considerations in the administration of justice which lead to the same result. It oftentimes would be a great hardship upon the parties to compel them to try out first the question whether the federal act applies, and, if it in the end shall be decided that it does not, then to test by further litigation their rights under the State statute. The short period of limitations provided in each act often might expire before a final decision could be reached. If adverse to the plaintiff on the ground of error in the form of relief sought, he thus might be barred from *358a just recovery. Although both the federal and State statutes as to amendments are liberal, U. S. Rev. Sts. § 954, R. L. c. 173, § 48, and are liberally interpreted in cases of this sort, Missouri, Kansas & Texas Railway v. Wulf, 226 U. S. 570, Herlihy v. Little, 200 Mass. 284, nevertheless the allowance of such amendments rests commonly in the sound discretion of the trial judge and is not subject to revision on exceptions. As it is not a matter of right, substantial interests might be lost through no fault of a plaintiff who constantly had been alert in his own behalf.
The federal act has been construed as covering injuries occurring at the moment when the particular service performed is a part of interstate commerce. Illinois Central Railroad v. Behrens, 233 U. S. 473, 478. Whether a railroad employee is engaged in interstate or intrastate commerce often involves legal discrimination of great nicety about which even the justices of the highest court are not always in harmony. Pedersen v. Delaware, Lackawanna & Western Railroad, 229 U. S. 146. St. Louis, San Francisco & Texas Railway v. Seale, 229 U. S. 156. North Carolina Railroad v. Zachary, 232 U. S. 248. It would be a saving of expense both to the parties and to the Commonwealth if the two actions could be prosecuted together, so that by one trial the facts could be ascertained and the causes ended by the determination of the governing principles of law. Where the settlement of an issue of fact depends upon conflicting evidence, it seems more likely that the truth will be ascertained by adducing all the evidence at one time before a single tribunal and enabling it to find out the real situation under an adequate statement of the governing rules of law applicable to all phases, than to require two distinct and successive inquiries before separate tribunals where only a single aspect of the incident could be open to investigation at one time.
There are important points of dissimilarity between the rights conferred and the burdens imposed under the two statutes. The rules of evidence may be different. The principles of law by which liability may be established under the two statutes are somewhat divergent. Difficulties will be presented in the trial which will require great care and a strong grasp by the presiding judge, and demand careful discrimination by jurors. But these *359are not insurmountable obstacles, nor do they appear to counterbalance the advantages which will accrue in permitting a conjoint prosecution of the two causes in appropriate instances.
So far as the reasoning in Louisville & Nashville Railroad v. Strange, 156 Ky. 439, and South Covington & Cincinnati Street Railway v. Finan, 153 Ky. 340, is inconsistent with the result here reached, we are not inclined to follow those decisions.
The defendant has contended that the plaintiff at least ought now to be compelled to elect which action she will rely upon. But the argument is not convincing. The plaintiff in each of the present cases happens to be the same individual. But that is an accident. Under the State statute she is given a right of action because she is the widow. She prosecutes that action in her own name and in her own interest. Gustafsen v. Washburn & Moen Manuf. Co. 153 Mass. 468. The action under the federal statute can be prosecuted only by the personal representative of the deceased for the benefit of the persons therein named, among whom may be included others than the widow. American Railroad v. Birch, 224 U. S. 547. Troxell v. Delaware, Lackawanna & Western Railroad, 227 U. S. 434. The plaintiffs in two such cases as these well might be different persons. In any event, they sue in different capacities. Under these circumstances it would be difficult to require an election. The reasoning upon the main point of this opinion leads to the conclusion that election ought not to be required at this stage. It is not necessary to decide whether an instance might arise where a plaintiff could be compelled to elect before the evidence is closed, nor whether at the close of the evidence an election could or ought to be required by the trial court. See Clare v. New York, & New England Railroad, 172 Mass. 211, 213.
In accordance with the terms of the report, the judgment for the defendant in the action of Corbett v. Boston & Maine Railroad is set aside, and both actions are remanded to the Superior Court for further proceedings there.
So ordered.