A section of route 6 of the NCR network runs along an old railway line from Derby, South to Worthington in Leicestershire.
It's around 14 miles one way.
I live at the southern end & have cycled may times along it as far as the Crewe & Harpur pub at Swarkstone (a slight detour from the track to Derby).
Its a pleasant rural ride with no traffic.
Also, searchig Google, I found this:
http://www.cyclederb.../leisure-routes
Chris J.
Update:
I just looked up your Cube XMS bike... nice, but I now realize that you probably want to play rough!!
