S.C. Code Ann. § 58-17-40

The provisions of the General Railroad Law shall apply to all property, to the receiving, delivery, loading, unloading, handling, storing or carriage of property on one actually or substantially continuous carriage, or as part of such continuous carriage and to the compensation therefor, whether such property be carried wholly on one railroad or partly on several railroads and whether such services are performed or compensation paid by or to one person alone or in connection with another or other persons.