A railroad right-of-way or a transmission line or another item of property of an electric or gas utility that is not located inside the limits of a municipality will not benefit from improvements, works, or facilities the district is authorized to construct. Therefore, a railroad right-of-way or a transmission line or another item of property of an electric or gas utility may not be annexed to the district unless the right-of-way or property is located inside the limits of a municipality annexed to the district.
Tex. Spec. Dist. Loc. Laws § 6913.061