This structure is intended for my other project: "Automatic Stock Sorter and Filler"!
A minecart retrieves the required items; simply place at least 1 item into the hopper.
The collected items are placed in the double crate, and the minecart only starts again when it's empty.
If there are no items in the hopper, the minecart will continuously circle the track.
CREATIONS
MINECRAFT-SCHEMATICS.COM