(a) The Arkansas Department of Transportation shall have power to require the building and maintaining of union passenger or freight depots, by two (2) or more railroads in any city of the first class or city of the second class in this state, when the business and conditions in the city justify or require such facilities.
(b) The making of any order for the erection and maintaining of any such union passenger or freight depots, or both, shall be prima facie evidence of the need for the facility and reasonableness of the requirement.