S.C. Code Regs. 117-311.6
S.C. Code Regs. 117-311.6. Railroads, Lumber Used for Repairing Railroad Cars
Lumber especially fabricated for use in repairing railroad cars is entitled to be purchased free of the tax under Section 12-36-2120(20), which exempts, among other things, from payment of sales or use taxes, railroad cars or locomotives and the parts thereof.