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I have messed around with the styrene mechanical retarters and they didn't work. At NMRA weight the cars are still too light and they ride up and derail. I have seen the bristle retarders in action and they do work except they are not adjustable for cars that roll a different speed are when the cars need to be slowed more because the track is getting full. I better way to do the bristle way would be to have rows that could be raised as needed to allow for more or less retarding. I would think that buying small round or flat paint brushes would work better than glueing bristles in a drilled hole. You could use brass tubing between the rails for bristle guides. <br /> <br />The first video from Kalmbach's layout tours series shows Don Santel's layout with an air retarder hump yard that works.
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