This suit was brought in a state court of Texas by the receivers of a Texas corporation, the International & Great Northern Railway, against the taxing authorities for Harris county. It seeks to enjoin the collection of the tax assessed for the year 1915 upon the so-called intangible property of the company within that county. The trial court denied the relief prayed; and, on defendants' cross action and a plea in reconvention, entered judgment against the plaintiffs for the amount of the tax. The Court of Civil Appeals reversed this judgment and granted the injunction. 197 S. W. 1043. Its judgment was in turn reversed by the Supreme Court of the state, which affirmed the judgment of the trial court. 229 S. W. 493. The case comes here on writ of error under section 237 of the Judicial Code as amended (Comp. St. § 1214), and also on a petition for a writ of certiorari, consideration of which was postponed until the hearing on the writ of error. The claims are that the statute under which the taxes were assessed is obnoxious to the Fourteenth Amendment, and that rights guaranteed by it have been denied in the administration of the statute.

Under the laws of Texas ad valorem taxes for both state and county purposes, are laid upon the property of a railroad in every county in which its line is located. The value is determined separately for tangible and for intangible property. The assessment of the tangible property is made by county officials. The assessment of the intangible property is fixed by the state tax board. It values the intangible property of the company as a whole; and then apportions the amount among the several counties on a mileage basis. Upon the aggregate of the assessments of the tangivle and the intangible property so made for each county, the tax is laid by the county officials at the rate found to be necessary and collected by the county's tax collector.1

Intangible values of a railroad company have been declared by the highest court of the state to mean 'the values of the railroad properties above the value of its physical assets.' Missouri, Kansas & Texas Ry. Co. v. Shannon, 100 Tex. 379, 390, 100 S. W. 138, 10 L. R. A. (N. S.) 681. Under the statute the value of the intangible is to be determined by deducting the value of the tangivle from the value of the entire railroad property. Article 7420. To enable the state board to determine the values, the company is required to furnish data. Articles 7415-7419. The board, on the other hand, is required to submit a preliminary estimate of the valuation and to give the company an opportunity to be heard thereon, so that changes may be made before the valuation is declared defective. Some methods of calculation are set forth in the statute; but it is provided that these are not to be deemed mandatory; that all available evidence must be considered; and that the method of calculation which will best bring about a fair valuation shall be adopted. Article 7419.

The board duly submitted its preliminary estimate. This it later amended upon the discovery of an error. Thereupon a hearing was held at which the company introduced evidence. The board adhered to its own estimate as amended. The aggregate assessment for the year 1915 upon this railroad's property within Harris county was $1,709,332. Of this amount, $603,227.44 was on intangible property. The tax rate was $1.09 1/2 per $100 of valuation. The amount of the tax so laid was $6,605.34. The trial court found that the actual value of the tangible property alone in Harris county was $3,205,202.09; and that the assessment upon this was only 34 per cent. of that value.

The contention that the statute violates the Fourteenth Amendment is wholly without merit. It has long been settled that the due process clause does not preclude a state from taxing the intangible property of a railroad, or from ascertaining its value substantially in the manner prescribed by the statute herein assailed; that the equal protection clause is not violated by prescribing different rules of taxation for railroad companies than for concerns engaged in other lines of business;2 and that the federal Constitution does not afford protection against double taxation by a state, which is here alleged.3 The writ of error is dismissed. The contention that the due process and equal protection clauses have been violated in administering the statute is rested upon many claims. Two of them are substantial. The writ of certiorari is, therefore, granted. But, for the reasons to be stated, the judgment below must be affirmed.

The company has 1,106 miles of road and extends into 37 counties. The alleged cost of its 'road and equipment' to June 30, 1915, was $46,502,041.55; its alleged depreciated value (as of June 30, 1914), $37,243,133.44; its value as fixed by the Railroad Commission, $34,013,092.07. A foreclosure was effected in 1911. The reorganization largely reduced the capitalization, leaving outstanding a mortgage debt of only $25,239,000, and capital stock of $4,822,000. The net earnings of the company in 1911 to 1914 were so small that, if the property were capitalized on the basis of 7 per cent., it would appear to have been worth less than $30,000,000 in 1912, and in 1914 less than $1,000,000. In the latter year the company, unable to pay its fixed charges, again passed into receivers' hands. The state tax board fixed the value of the physical property in 1915 at $28,372,810, and of the intangibles at $10,743,233; making the value of the entire property $39,116,033.

The receivers contend that, even if the value of the entire property was as found by the state board, the physical property was undervalued, resulting in an overvaluation of the intangibles so gross as to amount to a denial of due process of law. There was evidence, including statements made by the receivers, which supports the state board's valuation. The trial court, upholding this valuation, found that it represented the honest judgment of the state board; and that there was no evidence of arbitrary action or of improper motives on its part. This holding of the trial court was approved by the highest court of the state. There is no evidence of arbitrary action, of fraud, or of gross error in the system on which the valuation was made, to justify the claim of denial of due process. Pittsburgh, Cincinnati, Chicago & St. Louis Ry. v. Backus, 154 U. S. 421, 434, 14 Sup. Ct. 1114, 38 L. Ed. 1031; Maish v. Arizona, 164 U. S. 599, 17 Sup. Ct. 193, 41 L. Ed. 567, 610. Mere errors of judgment are not subject to review in this proceeding. Southern Ry. Co. v. Watts, 260 U. S. 519, 527, 43 Sup. Ct. 192, 67 L. Ed. 375.

The receivers also contend that the tax is void, under the equal protection clause, because the tangibles were intentionally and systematically assessed, by the county authorities, at not more than 38 per cent. of their actual value, while intangibles were assessed, by the state board, at their full value. Where illegal discrimination was practiced, it is immaterial whether it was effected by a single assessing board or through the action of two independent boards. Greene v. Louisville & Interurban R. R. Co., 244 U. S. 499, 513, 37 Sup. Ct. 673, 61 L. Ed. 1280, Ann. Cas. 1917E, 88; Southern Ry. Co. v. Watts, 260 U. S. 519, 526, 43 Sup. Ct. 192, 67 L. Ed. 375. Under the laws of Texas the assessments are made by the separate action of two independent boards using different methods, but the taxes upon the tangible and the intangible property if railroads are laid at the same rate, and are collected by the same county officers. It is the settled law of the state that equitable relief will not be granted, on the ground of discrimination, against an excessive assessment of either one, if, taking the tax on tangible and the tax on intangible property together, the taxpayer is not called upon to pay, on the average, on a higher percentage of the actual value than are other persons and property. Missouri, Kansas & Texas Ry. Co. v. Hassell, 57 Tex. Civ. App. 522, 123 S. W. 190; Druesdow v. Baker (Tex. Com. App.) 229 S. W. 493. Thus, the taxes on the two kinds of property are treated by its courts as parts of a single ad valorem tax on railroads. Their construction of the state statutes is binding upon us. The trial court found on adequate evidence that the aggregate assessment placed upon the tangible and the intangible property of the railroad in Harris county was about 45 per cent. of their aggregate true value, whereas the other property in the county was assessed at about 50 per cent. of its true value. Thus the railroad was not, in essence, subjected to any discrimination. Compare Davenport Bank v. Board of Equalization, 123 U. S. 83, 8 Sup. Ct. 73, 31 L. Ed. 94. The requirement of the equal protection clause was satisfied.

Affirmed.