S.C. Code Ann. § 58-17-1380

Whenever lines of two steam railroads cross each other on the same grade in this State, every train on either shall be brought to a full stop before reaching the crossing. But this section shall not apply when the crossing is equipped with interlocking devices, signal lights, semaphores or other safety appliances which shall indicate that the train may cross in safety or when a flagman or watchman is stationed at the crossing and he signals that the train may cross in safety.