S.C. Code Ann. § 58-17-3320

The Public Service Commission may require the installation and use by the railroads operating trains in or through this State of any safety device which, in its judgment, after due consideration and trial, shall have been proven materially to contribute to the safety of operation of trains and the protection of the lives and limbs of the crews operating such trains or the traveling public or to their reasonable comfort or the sanitation of passenger and freight trains on which passengers travel or employees work, as well as depots, both passenger and freight.