I spend quite a bit of my life staring out the window on train journey down to London from Edinburgh and back.
I see a lot of Roe deer from the train, but as you get down into Lincolnshire, Notts and Hertfordshire expect to see Muntjac and CWD. But never see them.
The railway line also provides a real corridor for deer movement. The sides of the track and pretty overgrown with scrubby bushes etc. Even just North of Berwick as the track goes along the coast there is still plenty of gorse and patches of scrubby woodland every few tens of yards apart.
How far will Muntjac venture into the open? Will they cross an open field or two to get to the next patch of cover. I suppose the Tweed will be a barrier, but would have thought they could spread up the valley and then move across. But how dense does a muntjac population have to be before the youngsters get pushed out and have to go on their travels to find a new terratory?