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  1. yamahammer

    A question about the history of MRR

    The book is By David Sutton and the last chapter is about Astrac-(automatic simultaneous train control) basically is intermediate-frequency radio waves on a carrier control basis. Very similar to model plane but using intermediate instead of high frequency. DCC is quite different. Astrac runs in...
  2. yamahammer

    Drywall Compound for Roadbed contouring?

    I've use Durabond 45 powder mix with so much sucess that I would use it over any premix, Scultamold, or pop. It comes in 25 lb. bags and goes along ways. It does'nt shrink or crack like premix will when its applied thick. I have cast hundreds of rocks with it. Things to know about it: It don't...
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