Wyo. Stat. Ann. § 37-9-404

It shall be the duty of the owner or owners of any railroad or other conveyance for the transportation of passengers to provide each agent who may be authorized to sell tickets or other certificates, entitling the holder to travel upon any railroad or other public conveyance, with a certificate, setting forth the authority of such agent to make such sales, which certificate shall be duly attested by the corporate seal, if such there be, of the owner of such railroad or other public conveyance and also by the signature of the owner or officer whose name is signed upon the tickets or coupons which such agent may sell.