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[quote]QUOTE: Originally posted by davsachz In the article the author used 1x2" or 1x3"s I believe and Expanded White foam 3/4 inch for his base. [/quote] No one uses expanded foam (the stuff used for foam party cups or foam coolers), it falls apart when cutting, sends off noxious fumes when carved with a hot knife and literally melts from the heat. Now extruded foam (usually pink or blue in nature) is much easier to work with, does not fall aprt when cut (makes clean up very easy compared to expanded), doesn't just melt away like expanded, but rather flows away from the knife and only while heat is applied. Unfortunatly, it also gives off bad fumes, so best to work in a well venilated area if you plan to hot knife/wire it. The benifits are enourmous though, instead of a 3/4" thick piece of heavy plywood, you can use a 2" think extruded foam based that's far lighter. you can carve the foam to make gullies, chasms and other unique things that would be near impossible with plywood alone. the sound absorption of foam over plywood is imense, cutting sound down to a mear fraction of what it would be on plywood. you can put the track directly on the foam and carve out your roadbed more realistically (slight sloping of into a ditch on the sides of the rails). thus making your scenery more realistic. Jay
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