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A friend of mine has a scanner which picks up radio waves. You can set the scanner to pick up Railroad Radio Signals. When a train is coming, a track warrant will be issued and the train's crew will say where they currently are and where they are heading. I am not for sure if Track Warrants are issued in CTC controlled areas. Through here, the signals automatically change when a train approaches. The train short circuits the electrical signal on the rails and tells the signals to change. If the signal light is red or yellow then you know a train is near. In CTC controlled areas, a red signal probably means no train is around, and yellow and green mean that a train has permission to pass the signal, which means that a train is approaching.
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