When required by the board, a railroad company shall construct and maintain at each station and siding a suitable platform for loading grain, livestock, and other commodities into its cars for shipment. The board may require the enlargement of the platform or the construction of additional platforms at a station or siding, when it deems it necessary for that purpose. A company that fails to construct the platform within 60 days after service of the board's order requiring construction, shall forfeit to the state $25 for each day that the platform remains unconstructed.