Here's a pub-quiz question.
Q: Name the railway line that had a Scottish station in England and an English station in Scotland?
A: The Tweedmouth to Kelso line. Coldstream station was at Cornhill and Carham station was in Scotland.
Here are some pictures, more to follow, of Coldstream station from the very excellent Northumbrian Railways website at: http://www.northumbrian-railways.co.uk/index.php?page=kelso-branch