Interesting discussion! In fact I am currently building a coasting drive into my KTM UP 4-6-6-4. I have already bought the DEMKO helical geared gearboxes (German company, O and Gauge 1) that have an internal reduction of 1:5 and can be turned by spinning the wheel axle. I have not yet set up the drive train since the two motors have just arrived. I am pretty sure the drive won't coast a lot downhill since the belt mechanism will surely generate some friction. But we'll see! I can't tell if this drive will be any better than a standard worm gear but I assume that it's going to be a smooth runner.
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