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Originally Posted by RJR
The bicolour LEDs have been used as an experiment in ground colour light signals, with three contacts (common/red/green) the signals can show red or green from the single lamp.
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Well I know that you're going for main aspect signals rather than calling on/shunt signals but if you did want ground or associated position light signals of the 1980s then white LEDs and red LEDs would do the trick. Red + White for ON as in the photo below, white + white for OFF.
http://www.bluebell-railway.co.uk/bl...pl_stop-31.jpg
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Originally Posted by and he also
Yes I know they are not prototypical but having tried to get my head round the mass of signals I would need for this junctio area I decided to go for modelmakers licence
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Interestingly enough, the very latest signals on the railway nowadays ARE high intensity LEDs where Red, Yellow & Green can all be created in one lamp.