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If by foamboard you mean foamcore used for signs don't use it. It warps when one side is painted. Use foam insulation (pink or blue) one inch thick if supported and 2 inch if not. To mark the track plan on it use a marking pen. Continue with it on the whole layout as transitions to plywood are a problem. To stick the track down various glues will work but AMI road bed or glazing tape make a good road bed that the track will stick to. I'm at risk mentioning it here but the May-June N Scale magazine has a good article on all foam bench work.
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