For ShaunCN:
Bytown Rly Society publishes th Canadian Trackside Guide every year (about March). It contains a six page section on signals, and I think the Canadian ones are now standard. You may be able to find a copy in a hobby shop.
The single light signals are pretty straightforward. It’s when you get 2 or 3 lights stacked up and flashing that you get indications like “Pass through the interlocking at a limited speed, then proceed at medium speed, but slow down at the donut shop for your takeout.”
There was a heated debate with name-calling in the Trains forum a few months ago, with prototype railroaders arguing over signal indications on their various roads.
Rights of trains is definitive on train orders, not signals.
Dave H.
I stand corrected.