Unveil the masterpiece that is the Woodland Scenics O Single Track Tunnel, an exemplary fusion of form and function that seamlessly elevates your model train landscape to extraordinary heights. Crafted with precision, these Tunnel Portals not only exude architectural finesse but also deliver indispensable structural integrity, expertly holding back formidable rocks and soil at tunnel entrances. Their authentic design is accentuated when paired with the additional Retaining Walls, creating unparalleled realism. Immerse yourself in customization with the effortlessly blendable Earth Colors™ Liquid Pigment, allowing you to imbue your creation with the vibrant and earthy hues of nature. Measuring an impressive 9 1/16 inches in width and 8 3/8 inches in height externally, and a generous 4 5/16 inches by 6 1/4 inches internally, this portal is designed to fit seamlessly into any O scale model. Elevate your diorama with a touch of realism and structural excellence; the Woodland Scenics O Single Track Tunnel is not just a choice, but a statement of quality and authenticity.