Thanks for that. I saw an AI-coloured version of an old photo of a local station with a maroon name board which I thought was wrong.I don't know the answer for certain, but three thoughts:
- My guess is that the norm would have been white lettering on a black background. A simple and cost-effective approach feels like it would have appealed when Sir Richard Moon chaired the board.
- The silly answer is that in all period photographs they will appear as sepia and cream!
- Your query raises the question as to when smaller (eg totem style) platform name boards came into general use. Were there many pre WW1, or was reliance placed on large running-in boards and porters calling out the name of the station? Quite a number of stations had their names illuminated on their platform lamp glasses. IIRC the letters were often coloured blue. I don't know if LNWR followed this trend or did something different.

The first image on this one page PDF file is interesting
It's a history of Lancaster Castle station, and the first image shows one of the old electric units at platform six, next to a station nameplate. Is the nameplate LMS or LNWR? The noticeboards are branded LMS, and the coaches appear to have LMS lettering.
But is that an old LNWR station sign?
I've cropped and expanded the photo below
View attachment 146139
PS - before anyone starts complaining, attempting to copy and paste an extract of the text from the original pdf isn't feasible nor would it be relevant