S.C. Code § 58-17-2510
Every railroad company receiving livestock for transportation shall cause such livestock to be loaded not more than two hours before the scheduled departure of the train carrying them and every railroad company delivering livestock at its destination for unloading shall cause them to be unloaded within two hours after the arrival of the trains carrying them, except that a longer time may be allowed if voluntarily consented to in writing by the owner or shipper on a paper other than the bill of lading. But this section shall apply in the unloading of stock only if the consignee in person or his duly authorized agent shall make demand in writing for such unloading within two hours after the arrival of the train carrying such livestock.
This section shall not apply at stations where no unloading pen is maintained or where there is no agent of the railroad on duty upon the arrival of such train.
S.C. Code § 58-17-2510