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 mesures 8" long by 3-3/4" tall, constructed of high quality birch plywood sides affixed to an 8" piece of track which is grooved on both sides. 2-1/2" tall bridge opening is high enough to accommodate our NameTrain letters. Compatible with our and other wooden train sets.