tz.tz. The Swiss did not invent the cuckoo-clock,
it is a genuine black forest product.
The Swiss may not have been so blood-thirsty, but they gave the world e.g. precision clocks and gears. Ever heard of a reliable Italian watch?
I was so inspired by Woodie's advice I set out early and found some standard flat plates, washers, a single chain link and a split pin to put together a link & pin system.
Some drilling and voila I think this is the answer to my grandson's woes (close to tears) every time a wagon(s) uncouples.
The length from wagon chassis to split pin seems a bit much - will check with the existing plastic ones - don't want the distances between wagons to look unnatural or have him grow up with faked realities
The link is to specifications for underground mining equipment in the UK. With a known curve radius you can work backward to get a maximum wheelbase to avoid flange-lifting. Note that the wagon weight does not appear to be part of the equation. There is probably some fudge factor in the equation but I wouldn't like to guess or calculate how much from first principles,
Unanderra in oz
That's the way George! It DOES look like it should. I am sure that somewhere there's a prototype for the couplers. I sort of reminds me of the "radial" couplers used on streetcars and other industrial types.
Maybe a bit of rusty paint (or not) and you're in business.
____________________ It doesn't matter if you win or lose, its' how you rig the game.