Recycle scrap and load the outputs onto a train.
The circuit network ensures:
- Only one type of item is loaded onto each train
- Items are only loaded onto a train if they can fill each cargo wagon
- Trains are only requested when an item type can fill all cargo wagons
- Train limits are set using constant combinator and amount of item types that can fill all cargo wagons
Requires use of train interrupts to let the train find the correct unloading station.