Roughly 22 miles total. You could stretch it down to Hadfield or New Mills central. It features old corroded masts and incandescent signal to this day. With green overhead wires and copper wires for the stretch over to Hadfield. Contrasting from urban to rural as you head down to Romiley.
While I like the idea of the environment, I've had my fill of outdated infrastructure from both TVL and NTP. What traction would be running on this line?