Walthers Update 57 –Walthers Cornerstone® Engineered Bridge System – New Additions Every railroad needs bridges and Cornerstone Engineered Bridge System components are the best way to add these impressive structures to your layout. Check out the new system bridges announced at the 2016 National Train Show in Indianapolis. See the entire range of Cornerstone railroad bridges here: https://www.walthers.com/catalogsearch/result/?q=933-45* See how Cornerstone Engineered Bridge System components work