(The highest tunnel and toughest climb* on the steam era network, combined with a light loading and small engines...)
A good route for the current / proposed stable of ex-GWR (and BR) DTG, Digital Traction and Victory Works steam locos.
It's nowhere near the level where it could be uploaded to the library, and my homebrew routes concentrate on track laying rather than asset building
But if there is any interest I'll start a thread on the route building page and see how far I can get