Been at Derby show today helping a friend run a layout. His stock is fitted with Kadees and he tells me he does'nt think they are a problem on any radius track so long as the magnets are not placed on the tightest part of the bends. This he says is more to do with the couplings not connecting rather than coming apart,ie the knuckles come together rather than the claw.
Hope this is of some use.
Paul.
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