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Without going into a long discussion of electrical resistance there's no "pat" answer to your question. With the proper connetions and feeders an "average" power pack of a 2 amp output is capable of powering several hundred feet of track with no problems. The major cause of voltage/current drop at the far end of a loop of track is poor contact between track sections. Rail joiners simply don't make a good electrical connection. In addition to the rail joiners solder the track joints also. Also add a "feeder" to the far end of the track loop. If you are using a power pack that came with a train set consider purchasing a better one. Train set power packs usually have a current (amp) output of less than 1/2 amp. That's less than a D Cell flashlite battery!!!....Hope this helped...Vic
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