David H. I'm on dial-up so I don't get to other sites easily, but today I did look at your pictures, your examples of link coupler vs knuckle coupler side frames is incorrect; the coupler-equipped link sideframe is actually a KC sideframe set missing it's slider shoe & box. Also your "early vs late" wheel picture is actually just mid-wheels, from the same axle sets, I believe. Just some corrections I thought you might want to make.
Rich, yes, quite likely that was done "back in the day" when parts were readily available, all one would need is the coupler adapter to screw onto the sideframe units. The drawbar, while prototypical was a bit cumbersome for play use.
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