The Manitou Incline, near Manitou Springs, Colorado, was constructed as a funicular in 1907. It operated until 1990, when a rock slide washed out the rail bed. Since then it has been used for hiking, and has become a very popular test piece for endurance athletes. The Incline starts at 6600 feet elevation and gains 2000 feet in roughly a mile. The old railway ties form many steps along the route.

The Tenmile Traverse according to summitpost.org:

Adam Gifford posted the route:

Clinton B. Portis posted the route:

I am planning an unsupported attempt on South (Monjeau Peak) to North (Nogal Peak) on the Crest Trail (T25) in the White Mountain Wilderness from (near) Ruidoso, New Mexico to (near) Nogal, New Mexico.  The only speed time I could find is "Big Blister" on Every Trail.  Their hike was listed as 10 hours.

This is a Premier Route. To claim an FKT on this route, you must meet a high standard of documentation and verification. See details here: https://fastestknowntime.com/premier-routes.