We are asked to decide whether petitioner has any right to the oil and minerals underlying its right of way acquired under the general right of way statute, Act of March 3, 1875, c. 152, 18 Stat. 482, 43 U.S.C.A. §§ 934—939.

The United States instituted this suit to enjoin petitioner from drilling for or removing gas, oil and other minerals so situated, and alleged in its complaint substantially that petitioner, in 1907, acquired from the St. Paul, Minneapolis and Manitoba Railway all of the latter's property, including rights of way granted it under the Act of March 3, 1875, a portion of which crosses Glacier County, Montana; that petitioner acquired neither the right to use any portion of such right of way for the purpose of drilling for or removing subsurface oil and minerals, nor any right, title or interest in or to the deposits underlying the right of way, but that the oil and minerals remained the property of the United States; and, that although no lease had been issued to petitioner under the Act of May 21, 1930, 46 Stat. 373, 30 U.S.C.A. §§ 301—306, petitioner claimed ownership of the oil and minerals underlying its right of way and threatened to use the right of way to drill for and remove subsurface oil.

Petitioner admitted certain allegations of fact, denied the allegation that title to the oil and minerals was in the United States, and asserted that it proposed to drill three separate oil wells—the oil from the first to be sold commercially, that from the second to be refined, the more volatile parts to be sold and the residue to be used on petitioner's locomotives, and that from the third to be used in its entirety by petitioner as fuel.

Pursuant to a motion therefor by the United States, judgment was rendered on the pleadings and petitioner was enjoined from 'using the right of way granted under the Act of March 3, 1875, 18 Stat. 482, for the purpose of drilling for or removing oil, gas and minerals underlying the right of way'. The Circuit Court of Appeals affirmed. 9 Cir., 119 F.2d 821. The importance of the question and an asserted conflict with Rio Grande Western R. Co. v. Stringham, 239 U.S. 44, 36 S.Ct. 5, 60 L.Ed. 136, moved us to grant certiorari. 314 U.S. 596, 62 S.Ct. 69, 86 L.Ed. —-.

The Act of March 3, 1875, from which petitioner's rights stem, clearly grants only an easement, and not a fee. Section 1 indicates that the right is one of passage since it grants 'the', not a, 'right of way through the public lands of the United States'. Section 2 adds to the conclusion that the right granted is one of use and occupancy only, rather than the land itself, for it declares that any railroad whose right of way passes through a canyon, pass or defile 'shall not prevent any other railroad company from the use and occupancy of said cayon, pass, or defile, for the purposes of its road, in common with the road first located'.1

Section 4 is especially persuasive. It requires the location of each right of way to be noted on the plats in the local land office, and 'thereafter all such lands over which such right of way shall pass shall be disposed of subject to such right of way'.2 This reserved right to dispose of the lands subject to the right of way is wholly inconsistent with the grant of a fee. As the court below pointed out, 'Apter words to indicate the intent to convey an easement would be difficult to find' (119 F.2d 825). That this was the precise intent of Section 4 is clear from its legislative history.3 While Section 4 provides a method for securing the benefits of the Act in advance of construction,4 no adequate reason is advanced for believing that it does not illumine the nature of the right granted. The Act is to be interpreted as a harmonious whole.

The Act is to be liberally construed to carry out its purposes. United States v. Denver, etc., Railway Co., 150 U.S. 1, 14, 14 S.Ct. 11, 15, 37 L.Ed. 975; Nadeau v. Union Pacific R. Co., 253 U.S. 442, 40 S.Ct. 570, 64 L.Ed. 1002; Great Northern R. Co. v. Steinke, 261 U.S. 119, 43 S.Ct. 316, 67 L.Ed. 564. But the Act is also subject to the general rule of construction that any ambiguity in a grant is to be resolved favorably to a sovereign grantor—' nothing passes but what is conveyed in clear and explicit language'—Caldwell v. United States, 250 U.S. 14, 20, 21, 39 S.Ct. 397, 398, 63 L.Ed. 816, and cases cited. Cf. Great Northern R. Co. v. Steinke, supra. Plainly there is nothing in the Act which may be characterized as a 'clear and explicit' conveyance of the underlying oil and minerals. The Act was designed to permit the construction of railroads through the public lands and thus enhance their value and hasten their settlement. The achievement of that purpose does not compel a construction of the right of way grant as conveying a fee title to the land and the underlying minerals; a railroad may be operated though its right of way be but an easement.5

But were are not limited to the lifeless words of the statute and formalistic canons of construction in our search for the intent of Congress. The Act was the product of a period, and, 'courts, in construing a statute, may with propriety recur to the history of the times when it was passed'. United States v. Union Pacific R. Co., 91 U.S. 72, 79, 23 L.Ed. 224. And see Winona & St. Peter R. Co. v. Barney, 113 U.S. 618, 625, 5 S.Ct. 606, 609, 29 L.Ed. 1109; Smith v. Townsend, 148 U.S. 490, 494, 13 S.Ct. 634, 635, 37 L.Ed. 533; United States v. Denver, etc., Railway Co., 150 U.S. 1, 14, 14 S.Ct. 11, 15, 37 L.Ed. 975.

Beginning in 1850 Congress embarked on a policy of subsidizing railroad construction by lavish grants from the public domain.6 This policy incurred great public disfavor7 which was crystallized in the following resolution adopted by the House of Representatives on March 11, 1872:

'Resolved, that in the judgment of this House the policy of granting subsidies in public lands to railroads and other corporations ought to be discontinued, and that every consideration of public policy and equal justice to the whole people requires that the public lands should be held for the purpose of securing homesteads to actual settlers, and for educational purposes, as may be provided by law.' Cong.Globe, 42d Cong., 2d Sess., 1585 (1872).

After 1871 outright grants of public lands to private railroad companies seem to have been discontinued.8 But, to encourage development of the Western vastnesses, Congress had to grant rights to lay track across the public domain, rights which could not be secured against the sovereign by eminent domain proceedings or adverse user. For a time special acts were passed granting to designated railroads simply 'the right of way' through the public lands of the United States.9 That those acts were not intended to convey and land is inferable from remarks in Congress by those sponsoring the measures. For example, in reporting a bill granting a right of way to the Dakota Grand Trunk Railway (17 Stat. 202), the committee chairman said: 'This is merely a grant of the right of way'.10 Likewise, in reporting a right of way bill for the New Mexico and Gulf Railway Company (17 Stat. 343), Mr. Townsend of Pennsylvania, the same Congressman who sponsored the Act of 1875, observed: 'It is nothing but a grant of the right of way.'11

The burden of this special legislation moved Congress to adopt the general right of way statute now before this Court. Since it was a product of the sharp change in Congressional policy with respect to railroad grants after 1871, it is improbable that Congress intended by it to grant more than a right of passage, let alone mineral riches. The presence in the Act of Section 4, which, as has been pointed out above, is so inconsistent with the grant of a fee, strongly indicates that Congress was carrying into effect its changed policy regarding railroad grants.12

Also pertinent to the construction of the Act is the contemporaneous administrative interpretation placed on it by those charged with its execution. Cf. United States v. Johnston, 124 U.S. 236, 253, 8 S.Ct. 446, 454, 31 L.Ed. 389; United States v. Moore, 95 U.S. 760, 763, 24 L.Ed. 588; Norwegian Nitrogen Products Co. v. United States, 288 U.S. 294, 315, 53 S.Ct. 350, 358, 77 L.Ed. 796. The first such interpretation, the general right of way circular of January 13, 1888, was that the Act granted an easement, not a fee.13 The same position was taken in the regulations of March 21, 1892, 14 L.D. 338, and those of November 4, 1898, 27 L.D. 663. While the first of these circulars followed the Act by 13 years, the weight to be accorded them is not dependent on strict contemporaneity. Cf. Swendig v. Washington Water Power Co., 265 U.S. 322, 44 S.Ct. 496, 68 L.Ed. 1036. This early administrative gloss received indirect Congressional approval when Congress repeated the language of the Act in granting canal and reservoir companies rights of way by the Act of March 3, 1891, c. 561, 26 Stat. 1101, 43 U.S.C.A. § 946, and when Congress made the Act of 1875 partially applicable to the Colville Indian Reservation by Act of March 6, 1896, c. 42, 29 Stat. 44. Cf. National Lead Co. v. United States, 252 U.S. 140, 146, 40 S.Ct. 237, 239, 64 L.Ed. 496.

The circular of February 11, 1904, 32 L.D. 481, described the right as a 'base or qualified fee'. This shift in interpretation was probably due to the description in Northern Pacific R. Co. v. Townsend, 190 U.S. 267, 23 S.Ct. 671, 672, 47 L.Ed. 1044, of a right of way conveyed in a land-grant act (13 Stat. 365) as a 'limited fee, made on an implied condition of reverter'.14 But the earlier view was reasserted in the departmental regulations of May 21, 1909, 37 L.D. 787.15 After 1915 administrative construction bowed to the case of Rio Grande Western R. Co. v. Stringham, 239 U.S. 44, 36 S.Ct. 5, 60 L.Ed. 136, which applied the language of the Townsend case to a right of way acquired under the Act of 1875. We do not regard this subsequent interpretation as binding on the Department of the Interior since it was impelled by what we regard as inaccurate statements in the Stringham case. Cf. Helvering v. Hallock, 309 U.S. 106, 121, 60 S.Ct. 444, 452, 84 L.Ed. 604, 125 A.L.R. 1368.

Congress itself in later legislation has interpreted the Act of 1875 as conveying but an easement. The Act of June 26, 1906, c. 3550, 34 Stat. 482, 43 U.S.C.A. § 940 declaring a forfeiture of unused rights of way, provides in part that: 'the United States hereby resumes the full title to the lands covered thereby (by the right of way) freed and discharged from such easement'. This language is repeated in the forfeiture act of February 25, 1909, c. 191, 35 Stat. 647, 43 U.S.C.A. § 940. Also on June 26, 1906, an act16 was passed confirming the rights of way which certain railroads had acquired under the 1875 Act in the Territories of Oklahoma and Arizona. The House committee report on this bill said: 'The right as originally conferred and as proposed to be protected by this bill simply grants an easement or use for railroad purposes. Under the present law whenever the railroad passes through a tract of public land the entire tract is patented to the settler or entryman, subject only to this easement'.17 It is settled that 'subsequent legislation may be considered to assist in the interpretation of prior legislation upon the same subject.' Tiger v. Western Investment Co., 221 U.S. 286, 309, 31 S.Ct. 578, 583, 584, 55 L.Ed. 738. See also Cope v. Cope, 137 U.S. 682, 11 S.Ct. 222, 34 L.Ed. 832; United States v. Freeman, 3 How. 556, 11 L.Ed. 724. These statutes were approximately contemporaneous with petitioner's acquisition of the rights of way of the St. Paul, Minneapolis and Manitoba Railway.

That petitioner has only an easement in its rights of way acquired under the Act of 1875 is therefore clear from the language of the Act, its legislative history, its early administrative interpretation and the construction placed upon it by Congress in subsequent enactments.

Petitioner, seeking to obviate this result, relies on several cases in this Court stating that railroads have a 'limited', 'base', or 'qualified' fee in their rights of way.18 All of those cases, except Rio Grande Western R. Co. v. Stringham, 239 U.S. 44, 36 S.Ct. 5, 60 L.Ed. 136; Choctaw, O. & G.R.R. Co. v. Mackey, 256 U.S. 531, 41 S.Ct. 582, 65 L.Ed. 1076; and Noble v. Oklahoma City, 297 U.S. 481, 56 S.Ct. 562, 80 L.Ed. 816, deal with rights of way conveyed by land-grant acts before the shift in Congressional policy occurred in 1871. For that reason they are not controlling here.19 When Congress made outright grants to a railroad of alternate sections of public lands along the right of way, there is little reason to suppose that it intended to give only an easement in the right of way granted in the same act. And, in none of those acts was there any provision comparable to that of Section 4 of the 1875 Act that 'lands over which such right of way shall pass shall be disposed of subject to such right of way'. None of the cases involved the problem of rights to subsurface oil and minerals.

In the Stringham case (239 U.S. 44, 36 S.Ct. 6, 60 L.Ed. 136) it was said that a right of way under the Act of 1875 is 'neither a mere easement, nor a fee simple absolute, but a limited fee, made on an implied condition of reverter in the event that the company ceases to use or retain the land for the purposes for which it is granted, and carries with it the incidents and remedies usually attending the fee'. The railroad had brought suit to quiet title to a portion of its right of way. Stringham asserted title to that portion by virtue of a purported purchase of surface rights from a placer mine claimant. The Supreme Court of Utah reversed the judgment of the trial court and remanded the case, directing the entry of 'a judgment awarding to the plaintiff title to a right of way over the lands in question'. 38 Utah 113, 110 P. 868, 872. The railroad again appealed, asserting that it should have been adjudged 'owner in fee simple of the right of way over the premises'. The Supreme Court of Utah affirmed the judgment of the trial court on the ground that the railroad's proper remedy was by petition for rehearing of the first appeal. 39 Utah 236, 115 P. 967. Both judgments were brought to this Court by writ of error. It was held that the second judgment presented nothing reviewable. The first judgment was affirmed since it 'describes the right of way in the exact terms of the right-of-way act, and evidently uses those terms with the same meaning they have in the act.'

The conclusion that the railroad was the owner of a 'limited fee' was based on cases arising under the land-grant acts passed prior to 1871 and it does not appear that Congress' change of policy after 1871 was brought to the Court's attention.20 That conclusion is inconsistent with the language of the Act, its legislative history, its early administrative interpretation and the construction placed on it by Congress in subsequent legislation. We therefore do not regard it as controlling. Statements in Choctaw, O. & G.R. Co. v. Mackey, 256 U.S. 531, 41 S.Ct. 582, 65 L.Ed. 1076, and Noble v. Oklahoma City, 297 U.S. 481, 56 S.Ct. 562, 80 L.Ed. 816, that the 1875 Act conveyed a limited fee are dicta based on the Stringham case and entitled to no more weight than the statements in that case . Far more persuasive are two cases involving special acts granting rights of way passed after 1871 and rather similar to the general act of 1875.21 Denver & R.G. Railway Co. v. Alling, 99 U.S. 463, 475, 25 L.Ed. 438, characterized the right so granted as 'a present beneficial easement' and Smith v. Townsend, 148 U.S. 490, 13 S.Ct. 634, 636, 37 L.Ed. 533, referred to it as 'simply an easement, not a fee'. We think that the Act of 1875 is to be similarly construed.

Since petitioner's right of way is but an easement, it has no right to the underlying oil and minerals. This result does not freeze the oil and minerals in place. Petitioner is free to develop them under a lease executed pursuant to the Act of May 21, 1930, 46 Stat. 373, 30 U.S.C.A. §§ 301—306.

During the argument before this Court it was fully developed that the judgment was rendered on the pleadings in which petitioner denied the allegation of title in the United States, and there was no proof or stipulation that the United States had any title. On this state of the record the United States was not entitled to any judgment below. However, we permitted the parties to cure this defect by a stipulation showing that the United States has retained title to certain tracts of land over which petitioner's right of way passes, in a limited area,22 and that petitioner intended to drill for and remove the oil underlying its right of way over each of those tracts. Accordingly the judgment will be modified and limited to the areas described in the stipulation. As so modified, it is

Affirmed.

Mr. Justice ROBERTS and Mr. Justice JACKSON took no part in the consideration or decision of this case.