Dear DTG I've just been reading in a rail magazine this month that Network rail have in excess of 1.5 million aerial photos of their routes taken in a helicopter and by drone to survey tracks, problems etc. It mentions that these are accessible to contractors so I thought I’d share for when the next uk route pops on the build radar if you need reference material. Hope it helps.
That is a wonderful shot over Glasgow, I must say. Also that wonderful Scottish Ballast Colour. Wish that was on Cathcart.