Wis. Stat. § 195.19

(1) Passenger. Every railroad shall provide and maintain adequate passenger depots equipped with proper toilet facilities at its regular stations for the accommodation of passengers, and said depots shall be kept clean, well-lighted and warmed, for the comfort and accommodation of the traveling public, and shall be kept open continuously from not less than 20 minutes before any train carrying passengers is scheduled to arrive and until such train has departed and for such longer period in any case as the office may determine is necessary for the convenience and accommodation of the public. Where the office determines that the service of certain trains in making stops on signals is in excess of reasonably adequate service, the provisions of this section shall not apply in connection with the rendition of such service.

(3) Union depot. In every city, village or town in which 2 or more railroads maintain passenger depots, it shall be the duty of such railroads to construct, maintain and use an adequate union passenger depot, whenever practical and required by public convenience and necessity. If, after investigation, the office shall determine that it is practicable and that public convenience and necessity required the construction, maintenance and use of a union passenger depot in any such city, village or town the office may order such railroads to construct, maintain and use an adequate union passenger depot, and shall in such order fix the location of such depot. If the railroads shall be unable to agree upon an apportionment of the original cost of such union passenger depot, and the expense of maintaining the same, within 20 days after the service of such order, the office may, after a hearing, issue a supplemental order declaring the apportionment of such original cost and the expense of maintaining such depot.