depending on the amount of point work and accessories is the heaviest gauge the best to use for accessory bus or is the load on this lighter than the main bus it seems reading posts it is preferable to have separate bus Wires
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It is not necessarily better to have separate busses. It depends a lot on the layout its size and the accessories that you intend to use.  Sometimes adding a separate bus just adds work and cost for little or no advantage. it can also add complication to frog wiring.

However, it is as much about power over distance as loading, so if you DO have a separate power bus for accessories, make ALL power bus wire the same as the track.

regards, Ahjay
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