Designing Track Signals

[rt35ge]

I've designed my first signal. In regards to the lights for the signal (green, yellow, red) Are these textures I put on the model and if not, how is the lightning done? Is it all thru the blueprint or do I have more work to do? I can't find jack to help me with this. RW docs, as usual for me, didn't help much. Are there docs explaining this?

Thanks

[rt35ge]

I've come across a tutorial by Papa Express on making signals. I should be able to navigate it and figure things out so I think I'm in business.