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Some folks fill the gaps with styrene filed to match the rail profile, but this is not necessary. A few small unsoldered gaps (with additional electrical feeders) are useful to allow the rails to shift with temperature changes or humidity induced benchwork changes. <br /> <br />If you are worried about the wheel flanges picking the gaps, say from twisting of truck mounted couplers while backing the train, file a small bevel into the rail corner to guide the flange smoothly across the gap.
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