A compact LLCCCC train unloader. Can compress four blue belts and works with red belts/red undergrounds. Due to the compact nature, this is capable of creating a complete main bus (4LanesBelt-2LanesEmpty-4LanesBelt-...). It uses circuit conditions to achieve the full belt compression and keep the chest usage evenly. This is more ups intensive than using stack limits, so if that is a concern you'll have to change it.