The maximum amount of privilege or license tax which the several municipalities within this state may annually assess and collect of persons, firms, or corporations engaged in the business of operating cars for the transportation, accommodation, comfort, convenience, or safety of passengers on or over any railway line or lines in whole or in part within this state, whether such cars are termed sleeping, palace, parlor, chair, dining, or buffet cars or by some other name, for the privilege of doing intrastate business within the limits of such municipalities, whether such companies are incorporated under the laws of this or any other state or whether incorporated at all or not, is fixed at $10.00 for each and every municipality.