Towards the end of this video (taken by me) there is an empty ore train, unusually routed via Mossend, I could 21 wagons.
https://www.youtube.com/watch?v=mJ47SReq68g
I waited all day that day for a triple header and came up blank, but I did get a lot of variety! There are 5 videos in the series, they should run one after the other.
Jim