(3-7/5" LONG x 1.43" WIDE x 2.43" HEIGHT 1.2" Clearance WIDTH 1.68" Clearance HEIGHT)Railroads were notorious for Queen Post Truss Bridges. They are a larger version of the King Post, and thus could span a much farther distance, especially with multiple spans. Railroad bridges were covered to protect the integrity of the bridge against rot due to inclement weather. The kit includes strip basswood and laser cut Roof Shakes. All drawings are accurate templates.