Wis. Stat. § 190.10
All rolling stock, locomotives, cars, automotive and motor vehicles, machinery, tools, equipment, fuel, supplies, materials, and other personal property of any railroad corporation used and employed in connection with the maintenance or operation of its railroad, for all purposes of this section and s. 190.11, are hereby defined and declared to be appurtenant to such railroad as real property; and all such property and all additional rights-of-way, depot grounds and other real property acquired subsequently to the execution of any trust deed or mortgage which shall have been described or provided for therein shall be subject to the lien thereof to the same extent as the real property therein described which the corporation owned at the time of its execution.
Wis. Stat. § 190.10