If you go back I did say that I did not have the time to read the whole thread and that If it hasn't been mentioned before could also be read as have you already got?
I have #16 to hand and #3 on the way.
Also good reading are
The LMS & LNER in Manchester by R.E Rose
Great Northern Railway Engine sheds Volume 3. Yorkshire and Lancashire
I don't know if you've got these books or not, I'm just letting you know that there is information in them.
no need to bite my head off for not spending the time to read all 50+ pages of this thread.