--- In [email protected], "David Heine" <davesn3@...> wrote:
> The sliding action is true for the 802's, but when you get to the #5's and
> similar models, the couple can only pivot around the center pin.  And they
> seem to work fine.

   Yeah, there's enough tolerance built into the Kadee design that it works in 
applications it was not even designed for. I imagine the S and O versions use 
the sliding shank with squared off pushing surface to minimize the chances of a 
long train buckling under pushing stress. When pushing against a round pin 
there's more out of column force being applied to the wheel flanges. If it 
works in practice then the theoretical advantage is not really important. As 
long as the HO couplers can withstand the stress of an S scale train they will 
be used as they offer some advantages when it comes to mounting methods and 
vertical shank offsets....DaveBranum 



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