In this case it really is the little things!..

Here is one of two Stop boards I have knocked together which are situated on roads around the depot area of my layout. They are based on the real ones made by MC Electronics.

They are a bit fiddly, but easy to make. If anyone wants measurements, then drop me a line.

They can be positioned either raised or lowered. Unfortunately they are non-flashing, but I think they suffice for my requirements.

P.S. I'll give you a fiver if you can make one for N gauge