Western Maryland Railroad speed limit signs

Greetings Trainzers,

I'm working on a little pet project in Trainz, modelling the Alpha-Jets along WM trackage. I'm overhauling the route first, and despite hours of effort, and trawling though photos on this terrific website:


But I can't find a single image or photo of the type of speedsigns that the WM used in the final years before they became part of Chessie, lets say 1965 to 1973. Does anyone know of a web resource that my chosen search engine has failed to find that might give me an idea of what they looked like in that era? Sorry to be lazy, but I have to go to bed at some point........

Thanks in advance