I concur, but do not want it to be implied that a railroad company may not also condemn land to be used as a stone quarry for the purpose of obtaining stone to use in railroad construction. It' is not practicable to purchase gravel in the open market. Gravel must be obtained at the nearest and most accessible points, so that it may be moved and handled at the least possible expense; otherwise, it would increase enormously the cost of railroad construction.