(1) The department shall centrally assess the interstate and inter-county continuous properties of the following types of companies:

(a) railroad;

(b) railroad car;

(c) microwave;

(d) telecommunications;

(e) telephone cooperatives;

(f) gas;

(g) electric;

(h) electric cooperatives;

(i) ditch;

(j) canal;

(k) flume;

(l) natural gas pipeline;

(m) oil pipeline; and

(n) airline.

(2) The property of a centrally assessed company is separated into two categories: operating and nonoperating.� All operating property will be apportioned to the taxing units as provided in ARM 42.22.121 and 42.22.122.

(3) The department will determine centrally assessed property based on the property's operating characteristics such as but not limited to property use, integration of operations, management, and corporate structure.