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Emil Tancredi end-of-train device
I have read about several FRED’s observed their apprearance. But I still like the MTH 20-89010 freight truck with operating ETD. With just a little dremel cutting, it is easily modified to fit on the knuckle of a large scale freight car. I modified one to fit on the end of my double stack train. It looks more prototype than anything I have seen and has a bright flash.