Double-Track Railroad Bridge Concrete Abutment pkg(2)Walthers Part # 933 4553, p. 175 Walthers 2021 HO Scale Reference. The Cornerstone HO Scale Double Track Railroad Bridge Concrete Abutment kit includes two concrete abutments with wing walls. The parts feature molded cut lines to make it easy to adjust their height to fit your scenery needs. Injection molded parts come molded in an appropriate base color.