Don't worry you'll spend LOTS of time reciting the signals and getting popped-quizzed on them. There's the movable signals (about 5 of those), the audible signals (about 10), fixed signals (a whole bunch), interlocking signals (even more), timers (the really tricky part - STUDY THESE CLOSELY!!!), and signs (a whole bunch, but these are the easiest once you actually learn them). When you take the test, they want DEFINITIONS. If they show you a sign that says
S
T
O
P
they don't want you to write "this signal means stop the train at the sign". They want you to write "a fixed signal found at the entrance to maintenance facilities and crosswalks in yards. Train Operators must stop the train and the proceed in accordance with special instructions"