Minecraft wiki entry for Digital_minecart_storage_system, associated text: For a single module are the materials: 56 blocks, 5 blocks of redstone, 23 redstone, 10 repeaters, 6 redstone torches, 2 sticky pistons, 19 hoppers, 11 powered rails, 1 detector rail, 4 rails, 13 slabs, 10 chests, 7 comparators.