Hi,

? The adage "if it ain't broke don't fix it" is a good one.?

? Having said?that - if you are doing -new- wiring (even of a small
section of an otherwise untwisted and existing layout) then twisting
the bus is the recommended practice -?and there is no reason not
to do so.? There have not been any?problems caused by twisted bus
wires.
? The RPs for bus wire and feeder wire sizes are also "best practices"
and should be followed for all new/replaced wiring.? As are the
recommendations for "separating wiring used for different purposes
from each other (as much as is possible/easy).? One of the most
common sources of wiring interference problems is the "neat?
freak" who just has to take a bunch of different wires and tie wrap
them all together in a cosmetically nice bundle (by different wires
I'm talking about wires for different purposes - such as bundling the
track power with the signaling bus).

? Although there are many, many layouts that have reported "no
problems" with untwisted bus wires - and I am not saying those
reports are wrong ... IF you have ever had to personally deal
with a layout that is having trouble with untwisted bus wires (and
DCC) then you will be in the "twist camp" - and will recommend
that all new bus wiring be twisted.? The amount of effort to twist
(before the wire is run/strung) is far less than "fixing it afterward".

? Again - there is no reason to rework/rewire a working layout.
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?- Jim