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Warming up a loco by running it a good long time is a given for speed matching.  And it is recommended that a new loco be run for at least an hour before attempting it. I agree.  I have now speed matched over 80 of mine in pairs and triplets and a few quads (could only use JMRI Decoder Pro for this) and yes, you will get different results always when the locos are cold.....(although I know there are those who have written in this forum that identical new locos run identically, I have not experienced it.) By the way, that also means your speed matched pairs, triplets or larger consists all need to be warmed up individually on each subsequent occasion.  Speed matching does not mean you can turn on the controller and drive off a consist of locos. You will NOT have them matched perfectly if you just start running them together from a cold start, regardless of brand. I heard of one club that doesn't  permit matched locos because they don't want poorly matched sets being dragged around. Now, here is another thing you may not have realized/experienced too.....you cannot match them in both forward and reverse.  Almost every loco runs differently in reverse and the CV settings for one direction are not useful in reverse.  Of my many pairs, less than 20% are close enough in both forward and reverse...so I limit the reversing when using a consist.  I do all the train makup with switchers and then drive it off forward with the consisted group.
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