Runaway Train is a double black diamond bump run that can be accessed by skiing the Enchanted Forest off of the Sunshine Express (lift 10).
This bump run is steep and narrow, and is surrounded by trees on either side.
The snow gets scraped off of the bumps pretty quickly, which can make the bumps icy.
This is a good run for folks looking for a challenge on the Sunshine Express area terrain, as most of the terrain off of this lift is geared towards beginner and intermediate skiers.
This run is never too crowded.