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Having been busy building an 8ft x 4ft layout containing 2 parallel running main lines and a goods yard of several sidings, temporarly laid out runs no probs with normal dc track clip as only wiring. I am going dcc. Will it work the same way or is it essential to bus wire it, or just advantageous to do so. Or not really necessary on this size layout. I do intend to floor out the loft later to build something about 16ft x 8ft which is the approx. space I'll have maybe more. Fancy doing Tyne yard and surrounding area as I worked from there as a railwayman for many years.
 

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If the 8x4 works well now under DC & with DCC you do not intend to have multiple trains running on the same loop, then I see no need to alter any wiring. When you increase the layout size, yes then wire each length of track via droppers to bus.
But on a 8x4, I would see only 3 locos moving at the same time on separate DC circuits anyway so conversion is mainly changing control systems & locos.
 
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