To amend title 28, United States Code, to permit the district courts of the United States to enjoin, suspend, or restrain certain State ad valorem property taxes on interstate gas transmission property, and for other purposes.

Amends the Federal judicial code to prohibit States from: (1) imposing a higher tax assessment ratio upon natural gas transmission property than is imposed upon other commercial and industrial property; (2) collecting an ad valorem property tax on natural gas transmission property at a tax rate that exceeds the rate applicable to commercial and industrial property in the same assessment jurisdiction; and (3) imposing any other tax that discriminates against a natural gas company subject to the jurisdiction of the Federal Energy Regulatory Commission, with an exception for fees charged gas companies for safety, environmental, or land use purposes.

Grants Federal district courts concurrent jurisdiction (without regard to the amount in controversy or the citizenship of the parties) to enjoin, suspend, restrain, or set aside such discriminatory tax treatment. Permits relief only if the ratio of assessed value to true market value of natural gas transmission property exceeds by at least five percent that of other commercial and industrial property in the taxing jurisdiction.