Ala. Code § 45-49A-64.11
Any resolution of the board or trust indenture under which bonds may be issued pursuant to this part may contain provisions creating a statutory mortgage lien, in favor of the holders of such bonds and of the interest coupons applicable thereto, on the transit systems, or any thereof (including any after-acquired property) out of the revenues from which such bonds are made payable. The resolution of the board or the trust indenture may provide for the filing for record in the office of the judge of probate of each county in which any part of such transit system, or any thereof, may be located of a notice containing a brief description of such systems, a brief description of such bonds, and a declaration that the statutory mortgage lien has been created for the benefit of the holders of such bonds and the interest coupons applicable thereto, upon such systems, including any additions thereto and extensions thereof. Each judge of probate shall receive, record, and index any such notice filed for record in his or her office. The recording of such notice, as herein provided, shall operate as constructive notice of the contents thereof.
Ala. Code § 45-49A-64.11 (1975)