Is there any known mechanism to take two or more moving ‘stacked’/‘merged’ minecarts (occupying the same space) and separate them automatically? I have seen splits happen at T-junctions, but haven't been able to reproduce them.
(For some reason merges happen spontaneously in my cart stack when I save and reload.)
I have thought of a mechanism to extract merged carts (send a slow cart up a slope; if it hits the top it was a double cart, but if it goes back down it was a single) but not one to separate them and put them back in service.
One phenomenon that might be useful that I have found is that bumping into carts while they are in a cart stack tends to cause one of the merged carts to ooze out of the stack (if it has room to move, i.e. the stack is boxed in on one side but not the other).