This is not specifically signalling-related, but over the last couple of weeks I've been working on a fairly extensive video of operations with my 4mm scale 1950's North Cornwall layout 'Egloshayle.' This is now completed and has been uploaded to 'YouTube.' You can view the first part of this five-part video here:
http://www.youtube.com/watch?v=seMcT2u5KnY
Part 1 on 'YouTube' does include some explanatory notes on the screen page, and these also serve as notes for all of the five parts. As the video has an explanatory commentary all the way through, I didn't feel it necessary to provide notes for every part.
At various points throughout the video you will be able to see the signals operating - these have mechanisms 'home-built' using memory wire.
I hope that you enjoy the video - it shows the interest engendered by operating a model railway in a prototypical manner rather than just 'watching trains go round.'
Peter Jordan