What follows is an opinion from the Supreme Court of the United States. Your task is to identify the court in which the case originated. Focus on the court in which the case originated, not the administrative agency. For this reason, if appropiate note the origin court to be a state or federal appellate court rather than a court of first instance (trial court). If the case originated in the United States Supreme Court (arose under its original jurisdiction or no other court was involved), note the origin as "United States Supreme Court". If the case originated in a state court, note the origin as "State Court". Do not code the name of the state. The courts in the District of Columbia present a special case in part because of their complex history. Treat local trial (including today's superior court) and appellate courts (including today's DC Court of Appeals) as state courts. Consider cases that arise on a petition of habeas corpus and those removed to the federal courts from a state court as originating in the federal, rather than a state, court system. A petition for a writ of habeas corpus begins in the federal district court, not the state trial court. Identify courts based on the naming conventions of the day. Do not differentiate among districts in a state. For example, use "New York U.S. Circuit for (all) District(s) of New York" for all the districts in New York.

Opinion:
MISSOURI ex rel. SOUTHERN RAILWAY CO. v. MAYFIELD, CIRCUIT COURT JUDGE.
NO. 15.
Argued October 16, 1950.
Decided November 6, 1950.
Floyd E. Thompson argued the cause for petitioners. Sidney S. Alderman, Bruce A. Campbell and H. G. Hed-rick were on the brief for the Southern Railway Co. Mr. Thompson, J. C. Gibson and R. S. Outlaw were on the brief for the Atchison, Topeka & Santa Fe Railway Co.
Roberts P. Elam argued the cause for respondents. With him on the brief was Harvey B. Cox.
Mr. Justice Frankfurter
delivered the opinion of the Court.
These two cases had their origin in suits based on the Federal Employers’ Liability Act, 35 Stat. 65, as amended, 45 U. S. C. § 51 et seq., brought in the Circuit Court of the City of St. Louis, Missouri. It is superfluous to give concrete details regarding the parties, the circumstances of the injuries, and the considerations affecting the choice of forum. It suffices to state that in both cases the plaintiff was not a resident of Missouri, the carrier was a foreign corporation, and the accident which gave rise to the claim of liability for negligence took place outside Missouri. In both, the doctrine of jorum non conveniens was invoked; in both, the trial court denied the motion to dismiss the suit on that ground as beyond the jurisdiction of the court to grant. In both cases original proceedings in mandamus were thereupon begun in the Supreme Court of Missouri to compel the trial court to exercise discretionary jurisdiction in disposing of the motions. After alternative writs of mandamus had issued and the causes had been consolidated for consideration, the writs were quashed by a single judgment. 359 Mo. 827, 224 S. W. 2d 105. We brought the proceedings here for review, 339 U. S. 918, because they involved questions important to the enforcement of the Federal Employers’ Liability Act by the courts of the States.
A decision by the highest court of a State determining that the doctrine of jorum non.conveniens cannot bar an action based on the Federal Employers’ Liability Act, in the circumstances before us, may rest on one of three theories. (1) According to its own notions of procedural policy, a State may reject, as it may accept, the doctrine for all causes of action begun in its courts. If denial of a .motion to dismiss an action under the Federal Employers’ Liability Act is rested on such a general local practice, no federal issue comes into play. (It is assumed of course that the State has acquired jurisdiction over the defendant.) (2) By reason of the Privileges- and-Immunities Clause of the Constitution, a State may not discriminate against citizens of sister States. Art. IV, § 2. Therefore Missouri cannot allow suits by nonresident Missourians for liability under the Federal Employers’ Liability Act arising out of conduct outside that State and discriminatorily deny access to its courts to a non-resident who is a citizen of another State. But if a State chooses to “[prefer] residents in access to often overcrowded Courts” and to deny such access to all nonresidents, whether its own citizens or those of other States, it is a choice within its own control. This is true also of actions for personal injuries under the Employers’ Liability Act. Douglas v. New York, N. H. & H. R. Co., 279 U. S. 377, 387. Whether a State makes such a choice is, like its acceptance or rejection of the doctrine of forum non conveniens, a question of State law not open to review here.
But, (3), a State may reject the doctrine of forum non conveniens in suits under the Federal Employers’ Liability Act because it may deem itself compelled by federal law to reject it. Giving the opinion of the Supreme Court of Missouri in these cases a scope most favorable to reliance on a non-federal ground, doubt still remains whether that Court did not deem itself bound to deny the motions for dismissal on the score of forum non con-veniens by its view of the demands of our decisions in Baltimore & O. R. Co. v. Kepner, 314 U. S. 44, and Miles v. Illinois Central R. Co., 315 U. S. 698.
But neither of these cases limited the power of a State to deny access to its courts to persons seeking recovery under the Federal Employers’ Liability Act if in similar cases the State for reasons of local policy denies resort to its courts and enforces its policy impartially, see McKnett v. St. Louis & S. F. R. Co., 292 U. S. 230, so as not to involve a discrimination against Employers’ Liability Act suits and not to offend against the Privileges-and-Immunities Clause of the Constitution. No such restriction is imposed upon the States merely because the Employers’ Liability Act empowers their courts to entertain suits arising under it. There was nothing in that Act even prior to § 1404 (a) of the 1948 revision of the Judicial Code, Title 28, U. S. C., which purported “to force a duty” upon the State courts to entertain or retain Federal Employers’ Liability litigation “against an otherwise valid excuse.” Douglas v. New York, N. H. & H. R. Co., supra, at 388.
Therefore, if the Supreme Court of Missouri held as it did because it felt under compulsion of federal law as enunciated by this Court so to hold, it should be relieved of that compulsion. It should be freed to decide the availability of the principle of jorum non conveniens in these suits according to its own local law. To that end we vacate the judgment of the Supreme Court of Missouri and remand the cause to that Court for further proceedings not inconsistent with this opinion. State Tax Comm’n v. Van Cott, 306 U. S. 511; Minnesota v. National Tea Co., 309 U. S. 551; Herb v. Pitcairn, 324 U. S. 117; 325 U.S. 77.
Judgment vacated.
Section 1404 (a) reads, “For the convenience of parties and witnesses, in the interest of justice, a district court may transfer any civil action to any other district or division where it might have been brought.” See Ex parte Collett, 337 U. S. 55.

Question: What is the court in which the case originated?

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Answer: 159