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: Passing trains drivers need to be careful though. If you press the red button that’s next to the bridge, it will quickly collapse, causing the train to fall to the canyon below. But don’t worry. You can simply put the bridge back together and the adventure can start all over again.