SDCL § 49-16A-31: Delivery to connecting carrier--Liability to final destination.

If a railroad accepts freight for a place beyond its usual route, it must, unless it stipulates otherwise, deliver the freight at the end of its route in that direction to another competent common carrier which goes to the place of address or is connected with other competent common carriers which go to the final destination. A railroad's liability does not cease until delivery of the freight has been made at its final destination.