@Kevinmatrin: I was running along the tracks down from Utliberg and to me it was clear that there was way to much gravel for my taste. I have followed the Sihl for awhile on foot and even if there is much paved road it is narrow and I would not like to try to ride it a good speed, does it get better further away from town?

I prefer doing the training riding from home so that not to much time is spent on trains and such.