Whenever the track of such railroad crosses a railroad or highway, such railroad or highway may be carried under, over, or on a level with the track as may be most expedient; and in cases where an embankment or cutting necessitates a change in the line of such railroad or highway, the corporation may take such additional lands and materials as are necessary for the construction of such road or highway on such new line. If such other necessary lands cannot be had otherwise, they may be condemned as provided in the Code of Civil Procedure; and when compensation is made therefor, the same becomes the property of the corporation.