As used in this act "right of way" means the roadbed of a line of railroad, not exceeding 100 feet in width, as measured horizontally at the elevation of the base of the rail, including the full embankment or excavated area, with slopes, slope ditches, retaining walls, or foundations necessary to provide a width not to exceed 100 feet at the base of the rail, but not including tracks, appurtenances, ballast nor any structures or buildings erected thereon.
N.J.S. § 48:12-125.1