S.D. Codified Laws § 1-44-26
At least one member, in the opinion of the Governor, shall be a person experienced in or having a favorable reputation for skill, knowledge, and experience in business management. At least one member, in the opinion of the Governor, shall be a person experienced in or having a favorable reputation for skill, knowledge, and experience in the operation of railroad service. At least one member, in the opinion of the Governor, shall be a person experienced in or having a favorable reputation for skill, knowledge, and experience in private or public finance. At least one member, in the opinion of the Governor, shall be a person experienced in or having a favorable reputation for skill, knowledge, and experience in marketing. At least one member of the commission shall be, in the opinion of the Governor, a person who is a user of rail service. Two members shall be from the public at large.
SDCL 1-44-26