Justin, I have two suggestions for you:
First, get out to the nearest control point that has something–anything–besides a diamond. Watch the signals as the train approaches, observe the varying combinations, match them to Mr. Solomon’s book, and learn what these signals mean in real life. What the signal does (or permits) is every bit as important as what it’s called, when you’re trying to understand them.
Speaking of “what it does,” check your local library for The Railroad: What It Is, What It Does, by the late John Armstrong. The book itself is very dry, and most of the text will be over your head for now. But he has one diagram in that book that shows some possibilities for these signals on a mythical railroad. This one page alone does a fantastic job of explaining the signals, what they mean, and where you’re likey to find them.
You see, in most cases, you’ll be dealing primarily with “Go”, “Stop”, and “Be ready to stop at the next signal”. Anything else tells you about how fast you’ll be traveling, which route you’ll be traveling over, and what you have to look for between there and the next signal.
Before I hired out for a railroad, I bought a booklet called All About Signals, the combination of two Trains Magazine articles written by the same John Armstrong. A lot of information in that, too, and pretty much the same diagram. Studying that diagram will show you the logic in the signal system, and in the names for the signals. I studied it, and was able to predict the movement of trains at control points fairly well before I hired out for a railroad. When I did get a job with the railroad, the rule book had the signals, but they had names that were strange to me. No matter–they performed the same function. Beyond that, however, you’ll find when working for a railroad that you’ve got to know the territory–what you do at a signal might not be covered in the rule book or special instructions as it is in the timetable or a divis