I've been pouring over an OS map and ringing features that are curious or just plain obvious. There are numerous dismantled railway lines and these can be followed until they disappear under new schemes or sometimes, just if you're lucky- they become tunnels. Many of them.
Also, there are stranger ones, a series of 'air vents', three in a line off Robroyston Rd. There are no other 'mine' related features nearby and not a great deal of buildings- almost in fields. I'm curious and will pay a visit real soon. Could just be cold war observation posts but theres three, stretching the equivalent length of the line that goes under 'Stazione' on Gt Western Rd.