Tex. Loc. Gov't Code § 73.015

After an election for the location or removal of a county seat has been held and the question settled, an application for another relocation of the county seat may not be submitted within 10 years after the date of the last election. However, an application may be submitted and a relocation election held within two years after the date of the last election to move a county seat from a site more than five miles from a railroad operating as a common carrier to a site on a railroad.