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White foam is sometimes called "beadboard" or expanded styrofoam. It is not as strong, and does not cut as well (all those little beads come apart...). Pink or blue styrofoam is extruded, and is very strong compared to the beadboard. If you want to use styrofoam for the subroadbed/decking on your layout, you can use the blue or pink over a frame only. If you use beadboard, you will need to have a complete layer of plywood underneath for strength. You will also need to be very careful about how you treat it, as it is damaged easily. However, if you are just using it for scenery only (on a plywood table top for example) the white beadboard is OK. Just watch out for the mess when cutting and shaping. Andrew
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