In May's issue of Model Railroader Magazine. I am stealing their straw idea. You take a drinking straw and put it through you layout. Then you run your wires for your lights, signals, etc. through it. It works! I have 2 inches of foam and a 1/4 inch of wood. I have already damage some Sunrise signal lights because of the no straws. I went to the dollar store and baught 100 for a buck!
Andy
Andy
