A prettier version of this can be seen on Chris Gordon's Homepage.

The following two examples are of the Victorian Signalling system, as explained to me by a PTC signaller. The top example is used on long signalling sections where trains run a fair distance apart at higher speeds. The lower example shows the system used on short signalling sections where trains run frequently and closer together.

               G       Y       R       R               G
___Train_2-->__R_______R_______R_______R___Train_1-->__R


               G     Y     R     R               G
___Train_2-->__R_____G_____Y_____R___Train_1-->__R

Green
 Red   Clear, Normal Speed


Yellow
  Red   Normal Speed, Warning


 Red
Green  Clear, Medium Speed (40kmh)


  Red
Yellow  Medium Speed (40kmh), Warning


Yellow
 Green  Reduce to Medium Speed (40kmh)


  Red
  Red   Low Speed, Warning
Yellow


Red
Red  Stop

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