This new Through Truss Bridge is the first truly American bridge offered by Atlas in N scale. The N scale Through Truss Bridge features simple, snap-together construction and specially designed bridge track. With two different colors to choose from (black and silver) for both Code 80 and Code 55 layouts, this bridge is perfect for any N scale modeler. Easy assembly, Highly detailed, Prototypical bridge track. Code 55 clearance: 1 3/8 inches Wide x 1 11/16 inches High, Length: 10 inches Width: 1 11/16 inches Height: 2 3/4 inches.