Hello gentlemen,
Some of you may already know what I'm on about but for those who don't, this is a great website that has lots of overhead images taken before and after the war of places all across Britain and some in Ireland, it is heaven if you find a track plan of a certain station you want to model, or what a certain goods yard looks like, all images are free to view, although if you make an account you can help others by identifying a certain picture and commenting on what it shows.
These are just 3 out of thousands that I've used as an example.
I've seen images of when the camera low down right beside a train, so there really is a huge range of images, something for everyone.
Click this link to go to the "Britain From Above" website and get searching, http://www.britainfromabove.org.uk/
I hope this comes in handy for some people as I know it's helped me lots,
Enjoy
Nelson
Bear in mind that its not only railway pictures so It can take some time to find something that is railway related, but using the search bar function is great and should speed the process up.