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I would assume there might be worry that a wiring short or something that gets hot in a small spot might cause a problem. But I would think, in the case of a short the foam would not catch fire but melt back until it is far enough away from the heat source that it would stop on its own. Just like when you use a hot wire to cut and shape it. But I am still new to the hobby (only planning layouts for 15 years. Now finally building one) and have no direct experience with foam. <br /> <br />
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