S.C. Code Ann. § 58-17-940

On the application in writing of a director or of any person or persons owning one-fiftieth part of the entire paid-in capital stock of any corporation operating a railroad or the bonds or other evidences of indebtedness of the corporation equal in amount to one-fiftieth part of its paid-in capital stock, the Office of Regulatory Staff must make an examination into the books of the corporation.