If a balancer of NxN is not available (where N is the # of cargo wagons), put a blueprint string of a balancer here.
Only balancers for 1, 2, and 4 cargo wagons are provided.
The balancer should be made of express belt and be facing upwards. If it is not "inline", make sure it sticks out to right and increase "wall space".
This is not required if bot-based.