How would it be, if the Passage-lengh-limit is at maybe 100 but from the Lengh 20 or higher it starts costing electricity? Because it would be a bit more realistic, when the belt (wich is probably powered by a electric motor) needs electricity to power itself. But it could also be, that there are micro stirlings built in and they only could Power the length of 20 Hexagons (limit at the time). The concrete costs of 2 per tile are totally ok for me.
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