The Department of Revenue is hereby authorized and empowered and it shall be its duty to assess any property required to be assessed by the Department of Revenue as the state assessor of railroads, which it discovers escaping taxation in former years by reason of not being assessed; and to assess or cause to be assessed and taxed, any such property which it discovers escaping taxation by reason of not being assessed in or for the benefit of any road district, school district, or other taxing district or municipality, although the property may have been assessed and taxed for state and general county taxes; however, the right to so assess property shall expire at the end of seven (7) years from the date when the right so to do first accrued. When any property is discovered escaping assessment and taxation which, under the law, is required to be assessed by the Department of Revenue as state assessor of railroads, the Department of Revenue shall assess the same for such purpose and for the years it has escaped taxation, and shall give notice by United States mail, or otherwise, by the Commissioner of Revenue of the Department of Revenue to the owner of the property, or agent, of such owner, showing what property has escaped assessment and for what years, and all other proper information, and the owner shall have thirty (30) days in which to file objections. The Department of Revenue shall deal with the assessment in all respects with the same powers as if made at the time regular assessment of such property is made, and shall have power to require such information as it may desire for the correct determination of all questions before it. When any objection is heard and determined, the Board of Tax Appeals shall by order approve or disapprove, or may modify the assessment, and make it final. If no objection is made in regard to the assessment or if the assessment is approved or modified by the Board of Tax Appeals, the Department of Revenue shall certify it to the clerk of the board of supervisors of the county or counties where the property is located, and such assessment shall be dealt with by the clerk and tax collector as is required in cases of assessments when made at the regular time. In all cases where suit is necessary, it shall be the duty of the Attorney General to represent the Department of Revenue whenever requested to do so.