The 33391 Collapsing Bridge Is A Fun And Exciting Addition To Any Brio World Railway Set.Over And Under: Build The Bridge Into Your Existing Railway Designs And Enjoy Driving Trains Over And Under The Bridge.Use The Two Ascending Wooden Tracks Included Help You To Get Up And Over The Bridge And The Lower Level Track Built Into The Base To Pass Under.Collapsing Chaos. This Exciting Bridge Is Designed To Be Fully Compatible With Other Brio World Toys, Making It A Great Addition To Any Brio World Railway Layout.