[lnwr20]

Hello Obstinate Cymric welcome to the forum, It depends on weather you intend to model the LMS or GWR as to what locos an coaches an liverys would have been running if you were to model somewhere like Builth Road Station you could run both LMS an GWR. The GWR ran services that called at the low level station an the LMS called at the high level station both had goods yards an there was a link line between the both but it was rarly used for through traffic or anything else it was uesd mainly by the GWR as another siding for there goods yard as for liverys, The LMS would have been black or maroon on the locos an Maroon coaches as for the GWR sorry i don't know but the low level station trains used to run from Cardiff, Myrthyr, an Brecon going to Moat Lane Junction on the Cambrian. The High Level Traffic was from Craven Arms to Swansea Victoria which is now long since demolished. If you need anymore help just let me know.