I think wires being the same length is a myth, but blocks are essential. I can say that about blocks from first hand experience. I would also recommend Barry's book. On my layout I used the OGR wire and MTH terminal strips. The OGR wire is in pairs so you have a red & black in the same jacket. The wires going to each of my blocks are close to the same length, but the lengths going to each block are different. I have not had a problem in close to 4 years (since I got it all running).
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