Am finding myself constantly returning to this thread at the moment, such a great project David, and exceptional modelling as usual!
Great to see a Swilly loco being modelled, not too many have ventured into the far north west of Ireland for their projects although Alan Gee's 'Burtonport' is a notable exception.
Very informative blog post here from Roger Farnworth, who always produces very readable material:
https://rogerfarnworth.com/2023/04/28/the-burtonport-extension-of-the-londonderry-lough-swilly-railway-part-1/