158782 is out in service today on the Calder Valley
Unless I'm missing something, this unit
hasn't been mentioned previously in this thread. I initially thought that this was a typo.
I can glean (sort-of) from the other thread that it transferred from ScotRail to Northern in convoy with two other units in early December:
Small fire reported to be on 485, however it was put out pretty quickly by the automatic fire bottles on said unit. As a result, 447,485, 465 then returned to Mossend, while 449 ran straight to Kilmarnock.
Meanwhile and more successfully (and to time) 158786,868,782 have transferred down to Neville Hill today from Haymarket on this move.
http://www.realtimetrains.co.uk/train/K91723/2018/12/10/advanced
It took my a while to work out why your comment was noteworthy.
I know that some people will know just from the number 782 that it's a former ScotRail unit, what type of seats it has, what livery it's in, where its home depot is and what date it transferred there, but
most people reading would have absolutely no idea of any of that. Most people, just from reading this thread, would have not much idea of where to look either to find out what was noteworthy about this unit working on the Calder Valley line.
The cascade structure is very difficult to follow even with carefully presented, accurate information, especially because units are leaving Northern at the same time that they are arriving.