The FKT starts at the Kandersteg trainstation direction Sunnbühel, Spittelmatte. Until there it was a easy 10k with +900m.

Then you leave the trail direction the face of Altels and the very step climb starts. After +1000m more the scrambling part starts. The final ridge is exposed and very steep (T5+ (II) the downhill is first tricky and then just like surfing. . 

From Spitttelmattesee to the top of Altels there is no path and exposed ridges!

You are free to find the fastest way from Kandersteg to Altels and back! No need to stay on the GPX track.

The Frisco Highline Trail https://www.ozarkgreenways.org/explore/greenway-trails/frisco-highline-trail/ is a scenic rails-to trail path that winds 35 miles through the picturesque Ozarks, connecting Springfield to Bolivar, Missouri. The trail was designated a National Recreation Trail by the National Park Service and American Trails in 2004.