The Trainwreck Extension follows the Trash Trail along the Cheakamus River beyond the main Whistler Train Wreck site.

Though not lengthy, the route offers river and waterfall viewpoints, with small but powerful falls that take on added character in snowy conditions. Several riverside access points along this stretch serve as pleasant spots to pause near the water.

Combined with other extensions, the trail can reach approximately 6 km in total, and the Trash Trail itself continues farther, all the way to Legacy Way.