(a) Upon examination of every such schedule and statement and all other evidence taken by it, the comptroller of the treasury shall proceed to ascertain and determine the value of such property within the state for taxation in accordance with the unit rule of appraisal where applicable, as determined by the comptroller of the treasury, taking into consideration the following factors where appropriate: the capital stock, corporate property, franchises, income, and the market value of the shares of stock and bonded indebtedness.

(b) The comptroller of the treasury may use any other evidence as is afforded by the statements and schedules or other evidence taken to enable the comptroller of the treasury to determine the value of the properties of such persons.

(c) In applying the unit rule of appraisal, the comptroller of the treasury shall allocate for taxation to this state its share of the unit or system value, taking into consideration the following factors where appropriate:

(1) The ratio of route and/or over-the-road miles traveled in this state to the route and/or over-the-road miles traveled in the system;

(2) The ratio of original cost of the property in this state to the original cost of the property in the system;

(3) The ratio of scheduled ground hours, gross revenue, and passenger miles in this state to the scheduled ground hours, gross revenue and passenger miles in the system; and

(4) The ratio of gross revenue, all track miles, ton miles, and tons originated and terminated in this state to the gross revenue, all track miles, ton miles, and tons originated and terminated in the system.

(d) The comptroller of the treasury may also consider any other factors that will help determine the state's share of the unit or system value.