Ala. Code § 37-2-132

When two or more railroad companies have roads running to or through the same town or city, or near enough thereto to receive freight traffic from said town or city, they shall, when required by an order of the Public Service Commission, make and maintain a physical connection between their respective tracks, where the tracks are of the same gauge, at such point in or near said town or city as the commission shall require, so that cars may be transferred from the one road to the other, and there may be an interchange of traffic between them, where such connection, in the judgment of the Public Service Commission, is reasonably practicable and can be put in with safety, and will furnish sufficient business to justify the construction and maintenance of the same where rights-of-way can be obtained by condemnation or otherwise, on terms deemed reasonable by the Public Service Commission. All railroads shall afford reasonable and proper facilities for such interchange of traffic the one with the other when so required by the Public Service Commission.