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Carpenter Matt's suggestion of foam sounds right. The street sections would have to be thin--and removable for maintaining the N system beneath. Also, would the cars and trucks be able to negotiate turns with rigid front wheels, or would something else be <br />needed, some kind of articulation? Do 1/43-scale slot cars have rigid wheels? And--I suppose the wheel-and-axle system would have to resemble that of slot cars and not simply be a wheel stuck on a metal shaft, because of the constant use involved. This <br />does get complicated....
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