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The standard for HO modules are 2 mains of code 100 and #6 turnouts spaced 5 and 7 inches on center from the outside edge and each module will connect to the next with a 9" straight (ie 4 and 1/2 per module). The rest of the module is anything goes. The standards are published online for anyone to see at www.nmra.org/standards/ms-1_0.html . You need not be a member to look at them.
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