S.C. Code § 58-17-3100
All railroads or other persons operating any system of cars, carriages or other conveyances for the purpose of transporting passengers for hire shall, when ordered so to do by the Public Service Commission, build, keep and maintain at all passenger stations and other places where people are regularly taken on and put off of such cars, carriages or other conveyances, two separate and distinct water closets, one for female passengers and one for male passengers and such closets shall be kept in fit and suitable condition for the use and convenience of passengers. But this section shall not be construed to have reference to flag stations on railroad lines where there is no regularly kept passenger station. Any person refusing, failing or neglecting to observe the provisions of this section shall be liable to pay a penalty of fifty dollars for each and every day he shall fail, refuse or neglect to provide such water closets, such penalty to be recovered by any citizen who will sue therefor, one half of such penalty to go to the school fund of the county in which such suit is brought and the other half to the citizen suing for it.
S.C. Code § 58-17-3100