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QUOTE (Doug @ 14 Oct 2008, 06:46) <{POST_SNAPBACK}>Test them on a piece of track, uncoupled and a few centimetres apart. If they are properly matched, they should move together forwards and backwards without coming together. Sometimes, its tricky to get it right. Having the addresses separate allows you to fine tune the locos individually.
As many of us have doubtless now discovered, removing a coupler per loco means that you are not forever having to uncouple if the matching is somewhat off when you start this process.

It may be advantageous when you have the matching completed to turn off Back EMF in one or more of the decoders, to prevent them 'fighting' when coupled up. Not experienced this myself, but it is fairly frequently reported.
 
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