No Tolls shall be demanded or taken by the Company for the Use of the Railway during any Time at which the Boards herein-before directed to be exhibited shall not be so exhibited, or at which the Milestones herein-before directed to be set up and maintained shall not be so set up and maintained ; and if any Person wilfully pull down, deface, or destroy any such Board or Milestone he shall forfeit a Sum not exceeding Five Pounds for every such Offence.