If the working of any such Mines or Minerals under the Railway or Works, or within the above mentioned Distance therefrom, be prevented as aforesaid by reason of apprehended Injury to the Railway, it shall be lawful for the respective Owners, Lessees, and Occupiers of such Mines, and whose Mines shall extend so as to be on both Sides of the Railway, to cut and make such and so many Airways, Headways, Gateways, or Water Levels through the Mines, Measures, or Strata the working whereof shall be so prevented as may be requisite to enable them to ventilate, drain, and work their said Mines; but no such Airway, Headway, Gateway, or Water Level shall be of greater Dimensions or Section than the prescribed Dimensions and Sections, and where no Dimensions shall be prescribed not greater than Eight Feet wide and Eight Feet high, nor shall the same be cut or made upon any Part of the Railway or Works, or so as to injure the same, or to impede the Passage thereon.