Ala. Code § 37-2-3

The Public Service Commission is charged with the duty of supervising, regulating and controlling all transportation companies doing business in this state, in all matters relating to the performance of their public duties and their charges therefor, and of correcting abuses therein by such companies, and the commission shall, from time to time, prescribe and enforce against said transportation companies, in the manner authorized in this title, such rates, charges, classifications of freight, storage, demurrage and car service charges, rules and regulations, and shall require them to establish and maintain all such public service facilities and conveniences as may be reasonable and just, which said rates, charges, classifications, rules, regulations and requirements the commission may, from time to time, alter or amend. All rates, charges, classifications, rules and regulations adopted or acted upon by any transportation company inconsistent with those prescribed by the commission acting within the scope of its authority, or inconsistent with those prescribed by any statute, shall be unlawful and void. And the commission shall enforce and require compliance with all the provisions of all laws now in force or hereafter enacted regulating railroads and other transportation companies or prescribing the duties thereof.