Derailer is a steep, black mogul run that is sometimes groomed near the top.
This trail begins at the end of Rollins Ridge near the top of Mary Jane, and leads to many other runs (expert ...
all 16 of them) accessed by the Challenger Lift, including four double-black diamond chutes that are sometimes open on big pow days.
Don’t head down Derailer if you don’t like bumps, because there’s no groomed way out.
The bottom half of this run has huge, steep bumps! A derailment is said to take place when a vehicle such as a train runs off its rails.
You could definitely become derailed on this this trail.