This Walthers Cornerstone HO Scale Single-Track Arched Pratt Truss Railroad Bridge kit is based on standard-design single-track steel bridges constructed to handle heavier trains on railroads from coast to coast. It's part of the Cornerstone Engineered Bridge System and is designed to be compatible with system abutments and bridge piers. This detailed model matches NMRA overhead clearances and will clear tall cars such as double-stack container cars and tall auto racks. It's ideal for use with the WalthersTrack Code 83 Bridge Track 948-83004 or other trackage of your choice. Single-Track Arched Pratt Truss Railroad Bridge kit parts come molded in dark gray plastic and feature simulated steel construction.