“ The court held that as the accident occurred August 4, 1915, the Act of Congress approved October 6, 1917 (40 Stat. L. c. 97, § 1, p. 395 [Comp. St. 1918, § 991, subd. 3] ) , 'saving * * * to claimants the right and remedies under the workmen's compensation law of any state,' was inapplicable, and that under the doctrine announced in Southern Pacific Company v. ”