Summary

I found the coupling loops with the Quarry trucks I produced were a little narrow and would cause trucks to jump the rails when pushed by the locos.

So a little time was spent and this produced. I fitted it to a 'lead' truck and it works fine but is a touch too long,

I may get around to adjusting it but don't hold your breath, ah, now you can breath, There's a shorter version in the second file.