Probably all on a grid

Support bridges?

Two resolver colors, red and blue

final train is gold
need to get gold into exit
how do we handle splits? which side is success and which side is failure
maybe set up like T junction
stem is input, left turn is consume, right turn is don’t?
wait, why even bother making two outputs, it can always just pass through if it’s not right

two kids passing trains back and forth

simon and mali
mali has all the trains
simon has nothing
simon is spoiled, and only wants certain configurations of trains

cool t-junction block that allows you to create loops

what if instead it’s always LU are inputs, R is success, D is failure