___Train_2-->__G______________Y_______R_______R___Train_1-->__G ^^^ This signal is sometimes omitted
|Green Full Clear, or "2" - Minimum of 2 signals before a stop signal.|
|Medium, or "1½" - Minimum of 2 signals before a stop signal, or 1 to a turnout.|
|Yellow Caution, or "1" - Minimum of 1 signal before a stop signal|
|Turnout. The next signal may be at stop.|
|. The next signal is not at stop.|
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