A simple 3D printed plastic tunnel for an N-scale train track 90 degree crossing. Tunnel opening cross-section dimensions: 1.4 inches wide (1.1 inches at the very bottom) 1.9 inches tall. Train not included. Tracks not included. 3D printed pieces always come with some minor surface artifacts. You can cut away strings, and you can lightly sand the surface. But don't go too deep, because the outer shell is only about 1 mm thick.