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Well, I can speak from experience.  My modular club has had instances of strange decoder issues (the ones listed on the NCE website linked).  Installation of RC filters and not running the bus in a circle cured most of these issues.  You cant fix human error with an RC filter. As both Alan Gartner and Mark Gurries state each layout is unique like a fingerprint.  Modular layouts especially can have wild variations in quality of work.  You can probably get away with not following all of the recommendations by doing quality wiring work.   My previous layout did not have RC filters installed, but my longest wiring run was only 30ft, and I did twist the wires for the whole thing.  I have seen RC filters work, and its pretty easy to install them, why risk a blown decoder (its one of the stated symptoms).  $80-120 vs $10 in parts and shipping.
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