S.D. Codified Laws § 1-44-25
The South Dakota State Railroad Board consists of seven members to be appointed by the Governor. Members shall serve a three-year term. No more than five members may be of the same political party. No person may be appointed to the board who is an elected official of the State of South Dakota or any subdivision thereof. Any member appointed to fill a vacancy arising from other than the natural expiration of a term shall serve only for the unexpired term, but may be reappointed to a full term. The board shall annually choose from its membership a chair, a vice chair, and a secretary-treasurer. No member may be removed from office except for cause.
The terms of members begin on October thirty-first of the calendar year. The appointee's term expires on October thirtieth in the third year of appointment.
Any member's term ending June 30, 2013, or thereafter is extended to October thirtieth in the year the term is to expire.
SDCL 1-44-25