Tex. Rev. Civ. Stat. art. 3865

Every express company doing business in this State shall give notice in writing to the Railroad Commission of the name, and official designation, of the person or persons, officer or officers charged with the management of its general office in this State, the location of its general office in this State, and shall from time to time give like notice in writing of any change in location of such general office, and of the person or persons, officer or officers in charge thereof.