Whenever the public utilities commission is of the opinion, after hearing had, as provided in section 4905.26 of the Revised Code, or upon its own initiative or complaint, that repairs, improvements, or additions to the plant or equipment of any public utility should reasonably be made, in order to promote the convenience or welfare of the public or of employees, or in order to secure adequate service or facilities, the commission may make and serve an appropriate order directing that such repairs, improvements, or additions be made within a reasonable time and in a manner specified in such order. Every such public utility, its officers, agents, and official employees, shall obey such order.