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Good stuff guys!  Let me play devil's advocate a little.  Jeff points out that his example is probably a worst case scenario.  He also states that the track MAY give a lttle help.  Here is my question, if you are running your longest length at about 25' (which is really 50' according to Jeff) and have feeders all throughout your layout (say about 6'-10' apart) won't the track help ALOT? (in this case I am using Kato Unitrack which I have found to have excellent conductivity). I must admit that I have a very limited understanding of electrical engineering.  Jeff's resistance formula is an excellent resource.  But as he pointed out, there is no way to really calculate this problem because of all the variables involved (track, etc.) The reason I am wondering all this is because I do have a readily available supply of 18 gauge wire.  I'm thinking I might give it a try and if I have problems, then just replace the 18 gauge with 16 gauge or 14 gauge.  Does this seem to be a stupid idea and a waste of time?  Be honest, you won't hurt my feelings and may save me a lot of trouble.
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