There is specifically exempted from any tax imposed by this chapter, as amended, including, but not limited to, §§ 26-52-301 and 26-52-302, the gross receipts or gross proceeds derived from the sale of parts and other tangible personal property incorporated into or which ultimately become a part of railroad parts, railroad cars, and equipment brought into the State of Arkansas solely and exclusively for the purpose of being repaired, refurbished, modified, or converted within this state.
Ark. Code § 26-52-428