Okla. Stat. tit. 68, § 68-2202: Classification of freight cars - Percentage of gross

revenue - In lieu of ad valorem tax - Application to public service

and private corporations.

All freight cars owned, operated, rented, leased, or used by any

freight line company, equipment company, or mercantile company which

are moved over, or used in the operation of, the line of any

railroad company, as hereinbefore defined, wholly or partially

within this state, are hereby classified for the purpose of

taxation; and a tax equivalent to four percent (4%) of the gross

revenue in this state, is hereby levied on such freight cars; and

such tax shall be in lieu of ad valorem taxes upon such freight

cars.

Nothing in this act shall be construed to exempt from ad valorem

taxation any real or personal property other than freight cars, or

any freight cars which are not operated over the line of any common

carrier railroad, as hereinbefore defined, upon which the gross

revenue tax herein levied does not apply. It is hereby expressly

provided that the provisions of this act shall apply to both public

service and private corporations.