This versatile bridge can be used two different ways: standing up with track on top as a trestle (in conjunction with our bridge set track) or flipped over with track on bottom as the bottom of a double-decker bridge system. Our Reversing Arch Bridge measures 8.7" long by 3.5" tall, constructed of high quality birch plywood sides affixed to an 8" piece of track which is grooved on both sides. 2.6" tall bridge opening is high enough to accommodate our NameTrains letters. Compatible with our and other wooden train sets.