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:
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.
Jared Campbell's WURL page describes it like this: "The Wasatch Ultimate Ridge Linkup or “WURL” is an incredible ridge route circumnavigating Little Cottonwood Canyon in the Wasatch Mountains of Utah. The route mainly consists of scrambling, boulder hopping, and a few rugged trails. It is ~36 miles long with ~18kft of elevation gain." Campbell's site gives much more information and a list of completions.
The Glacier Gorge Traverse and Rossiter's "Walk in the Park" are two related routes in Rocky Mountain National Park. They cover some of the same terrain, but they are different. The naming is confusing since the "Walk in the Park" traverses Glacier Gorge proper, while the Glacier Gorge Traverse encompasses Glacier Gorge, Loch Vale, Chaos Canyon and Tyndall Gorge.
The Glacier Gorge Traverse and Rossiter's "Walk in the Park" are 2 different but related routes in Rocky Mountain National Park. They cover some of the same terrain, but they are different. The naming is confusing since the "Walk in the Park" traverses Glacier Gorge proper, while the Glacier Gorge Traverse encompasses Glacier Gorge, Loch Vale, Chaos Canyon and Tyndall Gorge. Both routes start and end at the Glacier Gorge TH.
Cory Linfield posted the trail:
The Rainbow Trail is one of the longer hiking trails in Colorado, after the Colorado Trail and the Colorado section of the CDT. It runs roughly parallel to the Sangre de Christo mountains in the South Central part of the state, starting at one end south of Westcliffe and at the other end south west of Salida, forming an upside-down J. The trail is roughly 100 miles long with around 24,000 ft of gain according to a TOPO! map of the route.
Jared Campbell keeps a (long!) list of Wasatch area FKTs here. Includes running, scrambling and some climbing as well.
Here's how one publication describes Siphon Draw & the Flatiron, in Lost Dutchman State Park (east of Phoenix):