Ala. Code § 37-2-131: Connection of Tracks and Interchange of Traffic - Generally.

Railroads may be constructed so as to cross or connect with each other, by the main or branch tracks; and any person or corporation operating a railroad, when required, must transport or draw over such railroad, main line or branches, the passengers, freight or cars of any intersecting railroad, or any railroad connecting therewith, directly or indirectly, on reasonable terms, and for a reasonable compensation; but such person or corporation is not required to receive or transport the cars of any other railroad, unless such cars are adapted to the gauge of its track, are sufficiently strong, and are otherwise in proper condition for safe transportation.