Couldn't get the search function to work properly and have tried to have a wee look. No doubt I won't have looked hard enough.
Found this postcard on ebay.
Where abouts was this 'mountain railway'? I can't really think where it would be, cos was the exhibition not based in Kelvingrove? As I said had a look for a thread on it and couldn't find it. Thought it was an interesting postcard all the same.