S.C. Code § 58-17-2770
It shall not be lawful for any railroad company, chartered by this State, to discriminate against any railroad company which may connect with it, either at one of its terminal stations or at any intermediate point on its line where such companies have stations and agents established, by neglecting or refusing to deliver with due diligence to such connecting road, in the yard or on the track of such road, all cars wholly or partly loaded with freight consigned to points on such connecting road or to points beyond its line. When freight is to be delivered to a connecting road to complete its transportation, such delivery shall be made by the railroad which brought the freight to the connecting point and no additional charge shall be made therefor. But the delivering road may demand of its connection payment of all charges which have accrued thereon, on or before delivery of such freight on the tracks or in the yards of such connecting road.
S.C. Code § 58-17-2770