Any railroad company failing to construct any crossing after the order or decision requiring the construction of same has become final, within the time herein provided or within any extension of time granted by the commission, shall for each day's failure pay to the state a fine of not less than $10 or more than $100, to be recovered in a civil action in the name of the state, and it shall be the duty of the county attorney of the county within which is located the site of the proposed crossing to prosecute such action.
§ 69-14-611, MCA