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I redid a loop on my layout this past weekend so that I could get a longer run.  Let me preface this by saying I know I need more feeders on the line itself.  The longest portion is a straight of about 20 ft.  The problem I'm having is that about 8 feet from the primary feeder line, the engine will slow and loose power as it leaves an 072 curve.  Once it gets past this point, it regains speed and finish's the loop at a consistent speed.  I've got one other feeder line about half way through the entire loop, and note....there's only 2 lines to the track now simply because I just redid everything this weekend.  Overall, the loop is about 46-48 feet long.  Again, I know I need more feeders, I'm just curious why I'm losing power 8 feet off of the primary line, but then it picks up speed as soon as it leaves the curve.  The loop consists of standard "O" O72 and O54 loops in the turns, running 2 lines off a Z4000.  I've cleaned the track, checked pin connections and still nothing.  Passenger lights flicker in this one area as well but are smooth throughout the remaining part of the loop. Thanks in advance for the help.  My gut is telling me to change out the 72 curves in this area, but the track had little run time on it prior to laying down this new loop.

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Thanks Susan.  I already cleaned the track, so that doesn't seem to be the issue.  By a short, are you referring to the center rail shorting out through one of the insulators?  On visual, all look well, but that has indeed happened to me in the past.  Good point and will check it out tonight.  It kind of makes sense because as the train hits this curved portion, its at its cruising speed (or whatever speed I've got it set at) and may have just enough juice in it to get it over the bad area before picking up the voltage on the next good section.  Thanks for the tip.

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