OK thanks for that.
Do you mean something like this first picture,?
http://www.modelrailforum.com/forums/index.php?showtopic=2846
Looks more of a triangle, Red bottom left then White to the right and White above.
Thats the only type of model ground shunt signal I can find at the moment but still looking.
Ta
Wiggy.
Just found this
http://www.ebay.co.uk/itm/SO17RW-NEW-CR-SIGNALS-OO-GAUGE-GPLS-SHUNT-SIGNAL-RED-WHITE-WHITE-WHITE-/370604294029?pt=UK_Trains_Railway_Models&hash=item5649bcbf8d
Have used CR signals before but the picture on there web site was not very clear.
Wiggy.