The term "nonoperating property" means all land and improvements on such land, not situated on the right-of-way or station grounds of the railroad and not used as "operating property" within the meaning of the definition set out in §§ 10-28-1 and 10-28-2. The secretary of revenue may promulgate rules pursuant to chapter 1-26 to define "nonoperating property."
SDCL 10-28-11