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Kadee electric magnetic uncouplers
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The problem with using magnets is that they pull the car forward until the car passes and then it would pull the car back. The net effect is zero or at least nearly so (there is some effect from friction). <br /> <br />I have given some thought to your dilemma of a working retarder. Consider this and let me know what you think . . . Glue thin fibers (about a quarter inch high) to the ties of some track sticking straight up between the rails. As the car rolls on that piece of track, the fibers will rub against the axle and slow down the car. The biggest problems I can think of is that glueing enough fibers to do the job will be arduous at best and the fibers may need regular replacement. Maybe drilling small holes into the ties and dropping the fibers into the holes may help. They will still have to be secured with glue or something but it makes getting them to stand upright easier. I would suggest glueing them in two rows near the rail not along the centerline where the fibers would be a problem for the couplers. The fibers will have to be very flexible so they don't cause derailments and because they are flexible many would be needed. <br /> <br />If you are willing to go through the effort, I think this would function as a kind of retarder. <br /> <br />Good Luck - Ed
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