(a) Except as otherwise provided in subdivision (b), all property, real or personal, belonging to the persons, corporations, companies, copartnerships, and associations subject to taxation under this act, including rights-of-way, road beds, stations, cars, rolling stock, tracks, wagons, horses, office furniture, telegraph and telephone poles, wires, conduits, switchboards, all other property used in carrying on their business and owned by them respectively, all other real and personal property, and all franchises. See Michigan Laws 207.5

state: when applied to the different parts of the United States, shall be construed to extend to and include the District of Columbia and the several territories belonging to the United States; and the words "United States" shall be construed to include the district and territories. See Michigan Laws 8.3o