Now, a couple of years ago on certain other site, I did post this article, which shows the original locomotive from the Miniature Railway:
Now, a second locomotive from the Alton line is located at the Amerton Railway. (Although, it says this one was never used at Towers, so there must be a third engine lurking somewhere as they did run two trains when the line was doubled) As far as I can tell, this one is not operational at present.
http://amertonrailway.co.uk/new/about/locomotives/diesel/golspie/


Now, a second locomotive from the Alton line is located at the Amerton Railway. (Although, it says this one was never used at Towers, so there must be a third engine lurking somewhere as they did run two trains when the line was doubled) As far as I can tell, this one is not operational at present.

http://amertonrailway.co.uk/new/about/locomotives/diesel/golspie/