Railroad right-of-way, transmission lines and other property of electric and gas utilities that are not in the limits of a municipality will not benefit from improvements, works, and facilities the district is authorized to construct. Therefore, railroad right-of-way or transmission lines or other property of electric and gas utilities may not be annexed to the district unless the right-of-way, transmission lines and other property of electric and gas utilities are contained in the limits of a municipality annexed to the district.
Tex. Spec. Dist. Loc. Laws § 9055.060