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· Retired...
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The leads of the LED are 3 different lengths - note which goes to which pad and just test one and you have the answer for all of them :)

Go on to Maplins or similar web-site and look up the spec sheet for 3 leg bi-colour LEDs and it will ident by shap and length which leg is which. Also some 3 leg LEDs are DCC friendly by having a common anode - others are common cathode and fiddlier to wire for DCC.
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