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I dont do the railroad thing, but I caght a glimpse of the book. The author mentions a product called gypsolite for building scenery and its nonsuitability for molding. I suggest you add a product called land plaster or calcium sulphate to the mix. It will harden much faster and harder. Start with about a 3 to 1 gyp to land ratio for starters to test. you can vary this mix as you please. It will also help eliminate shrinkage. Steve Kerr 

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