Ala. Code § 37-13-11
Each authority shall have the power and is hereby authorized at any time and from time to time to issue and sell its revenue bonds for any of its corporate purposes. The principal of and the interest on all such bonds shall be payable solely from, and may be secured by a pledge of, the revenues derived by the authority from the operation, leasing or sale of any or all of its railroad properties and facilities, and other property. No bonds issued or contracts entered into by the authority shall ever constitute or create an obligation or debt of the state, or of any county, city or town within the state, or a charge against the credit or taxing powers of the state, or of any county, city or town within the state. Bonds of the authority may be issued by any time and from time to time, may be in such form, either in bearer form with appurtenant coupons (and subject to registration as to principal or interest, or both, all as the board may determine) or in fully registered form without coupons, and in such denominations, may be of such tenor, may be payable in such installments and at such time or times not exceeding 40 years from their date, may be payable at such place or places whether within or without the state, may bear interest at such rate or rates (which may be fixed or which may float or vary based on some index or other standard deemed appropriate by the board), and shall be payable and evidenced in such manner, all as shall not be inconsistent with the provisions of this chapter and as may be provided in the proceedings of the board wherein the bonds shall be authorized to be issued. Any bond having a stated maturity more than 10 years after its date shall be made subject to redemption at the option of the authority not later than the expiration of 10 years from its date and on any interest payment date thereafter at such price or prices and after such notice or notices and on such terms and in such manner as may be provided in the proceedings of the board wherein it is authorized to be issued. Bonds of the authority may be sold at public or private sale in such manner and from time to time as may be determined by the board. The authority may pay all reasonable expenses, premiums, fees and commissions that the board may deem necessary or advantageous in connection with the authorization, sale and issuance of its bonds. All bonds shall contain a recital that they are issued pursuant to the provisions of this chapter, which recital shall be conclusive that they have been duly authorized pursuant to the provisions of this chapter. Neither a public hearing nor the consent of any agency of the state or any subdivision thereof shall be prerequisite to the issuance of bonds by any authority. Notwithstanding the fact that they are payable solely from a specified source, all bonds issued under the provisions of this chapter shall be deemed negotiable instruments within the meaning of the negotiable instruments law of the state if they otherwise possess all the characteristics of negotiable instruments under the laws of the state.
Ala. Code § 37-13-11 (1975)