S.C. Code § 58-17-2780
It shall not be lawful for any railroad company chartered by this State to discriminate in favor of or against any railroad company which may connect with it, either at one of its terminal stations or at an intermediate point on its line where such companies have stations and agents established, as against any other railroad company which may connect with it at the same station or point, by refusing either to receive freight for shipment or to issue through bills of lading, at equal rates of freight therefor, to any one given destination reached by any or all of such connecting roads, or their connections, for which freight is received or through bills of lading are issued, to be forwarded by any other of such connecting roads at the same point, except that if any of such connections shall refuse to transport freight from its own terminus to the ultimate destination of such freight at the same rate as is charged by any other connection at the same point, the initial road shall be released from the provisions of this section and the connecting road shall not be entitled to the benefit of its provisions.
S.C. Code § 58-17-2780